Journal information: Nature Chemistry © 2012 Phys.org Explore further In its normal state, the C-O bond length is just 1.43Å, when present in oxatriquinane however, the bond length (also known as bond distance) is naturally stretched to 1.54Å. Bond length is the average distance between the nuclei of two atoms that are bonded together in a single molecule. The length of a bond is typically related to its order and more electrons tend to mean shorter bonds. To increase the bond length of C-O molecules in the compound oxatriquinane, the researchers replaced hydrogen surrounding the oxonium ion with alkyl groups of increasing steric demand, resulting in increased bulk. As the groups grew bigger, crowding occurred, resulting in push-back as they began to repel each other. That strain in turn resulted in stretching or pushing the C-O bonds even farther apart. Initial measurements found the bonds had been pushed to 1.60Å. A closer look using chemical synthesis and X-ray crystallography showed the bond had actually been stretched to 1.622Å. The researchers conducted a search of the Cambridge Structural Database and found no evidence that such a bond length with a C-O molecule had been observed before, which allowed them to pronounce the new length a record.The team notes that if tert-butyloxatriquinane were attached, it meant that they had attained the greatest degree of stretching possible without causing the molecule to break apart. They add that the C-O molecule is polar and extremely fragile which meant lengthening the bond was quite an achievement.In stretching the C-O bond, the team has helped to confirm theories that describe what happens when extraordinary strain is introduced into a molecular structure and what the limits of such experimentation might reveal. German team finds a way to link boron atoms with a triple bond (Phys.org)—Researchers at the University of California have succeeded in stretching a carbon monoxide molecule bond to a record length. In their paper published in the journal Nature Chemistry, the team describes how they built on previous work they’d done when building the compound oxatriquinane and noticed unusually long C-O bonds. This time around they swapped out the hydrogen surrounding the oxonium ion with other materials causing the C-O bonds to stretch to a record length of 1.622Å in ethers. More information: Extreme oxatriquinanes and a record C–O bond length, Nature Chemistry (2012) doi:10.1038/nchem.1502AbstractOxatriquinanes are fused, tricyclic oxonium ions that are known to have exceptional stability compared to simple alkyl oxonium salts. C–O bonds in ethers are generally ∼1.43 Å in length, but oxatriquinane has been found to have C–O bond lengths of 1.54 Å. A search of the Cambridge Structural Database turned up no bona fide C–O bond length exceeding this value. Computational modelling of oxatriquinane alongside other alkyl oxonium ions indicated that the electronic consequences of molecular strain were primarily responsible for the observed bond elongation. We also show that substitution of the oxatriquinane ring system with alkyl groups of increasing steric demand pushes the C–O bond to unheard of distances, culminating in a tert-butyl derivative at a predicted 1.60 Å. Chemical synthesis and an X-ray crystallographic study of these compounds validated the results of the modelling work and, finally, an extraordinary 1.622 Å C–O bond was observed in 1,4,7-tri-tert-butyloxatriquinane. Bond length, angle and dihedral distortion energies for diethyl ether (MP2/6-31 + G**). Credit: Nature Chemistry (2012) doi:10.1038/nchem.1502 This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only. Citation: Researchers stretch C-O bond to record length (2012, November 19) retrieved 18 August 2019 from https://phys.org/news/2012-11-c-o-bond-length.html
A joint collaboration between Educational Endowment Trust, Ministry of Culture, Government of India and UN Information Centre for India and Bhutan, it aims to celebrate linguistic diversity and promote universal peace. This event will see the participation of school children from these 17 countries – India, Azerbaijan, Belarus, Bosnia & Herzegovina, Brazil, Bulgaria, Germany, Kyrgyzstan, Papua New Guinea, Philippines, Tanzania, Tunisia, Ukraine, Hungary, US-TX, Georgia and Russia. Also Read – ‘Playing Jojo was emotionally exhausting’ The city will boast international presence as 43 international students and 18 mentors will participate along with 350 Delhi Schools on the theme- “Vasudhaiva Kutumbakam – ‘The world is one family’. The Capital’s Springdale’s School, The Frank Antony Public School, Ahlcon International School, Mata Gujri School, Tagore International School and Bluebells International School are also participating. Bilal Acikgoz, one of the coordinators of IFLC 2016, said: “We believe that understanding different languages and cultures helps us understand each other better, and that is the motive behind IFLC.” Also Read – Leslie doing new comedy special with Netflix Lauding the potential of Indian students he said, “I would also like to share that in India we have seen tremendous talent and potential in the students. They deserve serious attention of global educational and cultural organisations.“I think the international education fraternity should work in close cooperation with their Indian counterparts to provide the opportunities the Indian students truly deserve. The Educational Endowment Trust itself is keen to explore the talents of Indian students in other parts of India as well, especially in states like Maharashtra, UP, Punjab, Tamil Nadu and Uttarakhand.” IFLC is a global effort to facilitate a cordial engagement between the young change makers from different parts of the world. Their mission clearly says- “It is our mission to rise on the wings of art and music and promote peace, love, and cultural encounters throughout the world’. India will witness the event for the first time since its inception in 2003.
* Cotton and cotton blends: Cotton has always been a preferred fabric for every age group with a wide range of prints, textures and motifs. With its unique features and multipurpose approach, cotton has become a largely used fabric in the garment manufacturing sector. * Bamboo and bamboo blends: Bamboo fabric is very soft, often described as feeling like cashmere. This is because the bamboo fibre itself is naturally round and smooth without any chemical treatment. It can be worn directly to the skin due to no sharp spurs to irritate the skin due to its organic nature. Also Read – ‘Playing Jojo was emotionally exhausting’Bamboo fibres are also quite long which means that there is less piling of the fabric than in the cheaper varieties of cotton. The softness and quality of the fabric itself seems to stand up to multiple washings. * Rayon and rayon blends: Rayon and its blends are made of natural cellulose which is chemically processed to produce fibres. Its ability to absorb humidity makes it a perfect fabric for summer just like linen or cotton. Rayon should be dry cleaned due its shorter durability.* Fine polyester and polyester blends: It is an ideal fabric for warm garments and soft accessories such as blankets, caps, mittens, and bibs.
As winter sets in, early mornings become more pleasant than ever and the concept of ‘Morning Ragas’ catches on. The eighteenth edition of ‘Morning Ragas’, a series introduced by Legends of India in association with Sangeet Natak Akademi, was organised in the national Capital, recently. The depth, the style and perfectness of Kedia Brothers in presenting the tradition of ‘Maihar Gharana’ with effortless ease, enchanted the audience. It is said that when lord Shiva was carrying the body of the dead mother goddess (Mai in Hindi) Sati, her necklace (har in Hindi) fell at this place and hence the name ‘Maihar’ (Maihar = Mai+Har, meaning the ‘necklace of mother’) was originated. The Kedia Brothers had a wonderful taiyari, perfect mutual understanding and marvelous anticipation which attracted the audience to the dizzy heights of ecstasy and brought them to fathom eternal tranquility and serenity of music. Also Read – Add new books to your shelfWith young talented artistes, many young music lovers swayed their heads and tapped their feet while some sat still – heads bowed and eyes shut – in deep thought, throughout the soulful recital in ‘Raag Sindhu Bhairavi’. Mormukut and Manoj Kedia commenced their concert with ‘Raag Todi’ where vilambit and chhota khayals were set in ‘Teen taal’.Then the artiste-duo drenched the audience in the labyrinth of music-ocean. Through their soulful and intelligently woven presentation of both the ragas they depicted their absolute command and maturity in their crafts. It was indeed an amazing and spectacular jugalbandi of two great artistes in a true sense. Also Read – Over 2 hours screen time daily will make your kids impulsiveThe Founder Chairman of Legends of India and the curator of Morning Ragas, Dipayan Mazumdar said that the purpose of presenting these soulful renditions were to bring the young generation into the fold of Classical music and uphold our Cultural traditions.Over the years, traditional ragas meant to be played essentially in the mornings have been widely neglected. Therefore, the concept of this weekend series was designed by Legends of India primarily to resurrect our tradition and cultural heritage. ‘Morning Ragas’ shall help re-live the traditional morning ragas which are on the verge of extinction. This concept of the on-going series is designed to promote dedicated young musicians. The series of ‘Morning Ragas’ showcase the Legends in the making.
In winters, cold weather and low humidity levels results in dry air which then steals moisture away from the skin every second of every day. Without immediate care, dry skin can lead to cracking, bleeding and patchy skin. Indoor heat further robs the air of moisture, as do hot showers or baths and harsh cleansers.Megha Shah, cosmetologist, Nirmal Randhawa, make up artist at Indica Makeover Studio have shared a few skin care tips that can be followed during winter season: Also Read – Add new books to your shelf1. Wash in lukewarm water – Hot showers and baths always feel good in the winter, but when you can, particularly when just washing your face and hands; choose lukewarm water to avoid stripping as many oils away from the skin. 4 Moisturize Immediately afterwards – Skin needs lots of moisturizing in winters. . Few drops of essential oil in water while bathing will help moisturize the skin. Applying moisture to damp skin help seal the dampness in the skin. Also Read – Over 2 hours screen time daily will make your kids impulsiveIn winters, the skin becomes dry very quickly. So giving an overnight moisturizing therapy to skin, before going to sleep is a very good idea.If you want to get a glowing skin quickly, try using ice and moisturizer. Put few drops of moisturizer or malai on an ice cube. Massage your face with this cube for 2-5 minutes.2. Water consumption – All of us tend to drink less water in winter because we turn to hot drinks like tea and coffee, but we often forget our skin needs hydration from inside, out. A little warm water with lemon can be very refreshing and hydrating at the same time. 3. Change the cleanser – Cleansers can prove to be extremely drying to the skin. After using a cleanser, never leave the skin naked for more than 30 seconds, as this can dehydrate it, leading to increased dryness. Apply a hydrating toner and moisturizer to seal in the moisture.4. Use of homemade masks – Homemade hydrating masks can provide needed moisture in the winter months. Use natural moisturizing ingredients like honey, avocado, yogurt, olives, bananas for glowing skin rather than going for chemicals and toxins. 5. Cool breeze may deprive your skin of the essential moisture that keeps it soft. Apply and then reapply the moisturiser. But make sure that it is not too heavy for your skin. Otherwise, it will make your skin look oily and dark. A gel-to-cream base moisturiser would be ideal for any skin type.6. Have a nutritionally rich diet or food items rich in Omega 3 for a glowing skin. Nuts and seasonal vegetables are great for your skin. Avoid starchy and sugary foods as they may cause bloating and acne.7. Since your skin is already dry during winter season, excessive exfoliation will wash off all the natural oils from the skin and can damage it badly causing redness. Use gentle exfoliators like oatmeal and coffee powder, and seal it with a cream.’
Kolkata: State BJP president Dilip Ghosh allegedly travelled in a car with ‘police’ sticker pasted on its windshield on Sunday at Durgapur. Later, a local resident identified as Akhil Shee lodged a complaint against Ghosh, narrating the incident on Monday at Durgapur police station, requesting necessary action.On Sunday, BJP organised rallies across the state, calling them ‘Sankalpa Yatras’. As per their plan, BJP supporters gathered at the Rajiv Gandhi Maidan in Durgapur. Local BJP leadership was preparing to start the rally which was supposed to be led by the party’s West Burdwan district president Lakshman Ghorui. Also Read – Bose & Gandhi: More similar than apart, says Sugata BoseBut just before the rally was about to commence, police asked the BJP leaders to stop as the rally had no permission. As Ghorui and the others refused to follow the order, they were arrested. After some time, Ghosh arrived at the spot in a car. He was seen sitting in the front seat. A ‘police’ sticker was pasted on the driver’s side, while in front of Ghosh a logo of BJP was seen on the windshield. West Burdwan Trinamool leaders have alleged that Ghosh used the sticker for extortion purposes. Also Read – Rs 13,000 crore investment to provide 2 lakh jobs: MamataGhosh claimed that his security personnel, who are policemen, use the car which is why the sticker was on the car. Though the BJP leader is allegedly not taking the issue seriously, no one other than police personnel can use a car with ‘police’ sticker pasted anywhere on the car. Interestingly, the vehicle in question bearing registration number WB 08B 6307, belongs to one Roshmi Doll Chakraborty and is registered with the Regional Transport Authority, Salt Lake, as per the database of Union Ministry of Road Transport and Highways.
Kolkata: The body of a woman was found inside her house on Friday morning at Kulberia village in Kolkata Leather Complex.The deceased identified as Rinku Dey (18) was alone in the house last night. Her husband was out of the city for work. According to sources, on Friday morning, around 7 am, one of Rinku’s neighbours called her but got no response. When he went inside he found the door of the house was open and Rinku was lying on the ground in a pool of blood. Immediately Rinku’s neighbor called up her husband Avijit. Kolkata Leather Complex police station was also informed. Also Read – Rs 13,000 crore investment to provide 2 lakh jobs: MamataLater, police investigated the crime scene and found an injury mark on her head caused by a heavy object. According to police, Avijit works in a private security service provider and was on duty when Rinku was killed. After her body was sent for autopsy examination, sleuths from homicide section of Detective Department (DD) also investigated the incidetn. A sniffer dog was also brought but that did not help much in the investigation process. A murder case has been started at the Kolkata Leather Complex police station. Probe is on to nab the murderer.
During the Great Depression, which lasted from 1929 to 1939, the U.S. government sent a multitude of photographers out around the country to document the pains and trials that many Americans were suffering during this time. It was meant to be a way to help show American life during the Depression, especially the struggles of rural life. The photographers captured families living in shacks, children dressed in rags, workers in factories, and the farmers who spent hours outdoors trying to save their crops.They would also document the eerie landscapes that featured abandoned homes falling apart. But it wasn’t all just somber photos. Photographers would also document friends playing, siblings laughing together, and sometimes even pets.Fennel Corbin who is being resettled on new land, Virginia.Before heading out to capture images, the photographers were briefed over what the photography board wanted to see.Boy selling pecans by road, near Alma, Georgia.The board, headed by Roy Stryker, a photographer and economist who worked for the Farm Security Administration, was very specific in their requests and had extremely high standards.Setting out rows of celery, Sanford, Florida.So high, in fact, that if Stryker reviewed a negative that he found to be of poor quality, he would punch a hole into it which would prevent the image from ever being used again.An employee of the grapefruit canning plant at Winter Haven, Florida.The small yet obvious hole in the photo would be placed in various areas. One might block out the face of a person while another would be placed up in a corner looking like a dark sun over a vast field.Children of a sharecropper, North Carolina.Some of the best slang from the 1930s era.Cutting hay, Windsor County, Vermont.The checklist Stryker used to determine whether the image was used or not isn’t really known. However, sometimes if the image wasn’t focused or taken with a tripod, it could mean an instant hole punch.Iran hostage crisis – Iranian students storm the U.S. embassy in Tehran.Other times, if the negative showed success in certain areas that could make a specific group of people look bad at the time, it would also be ruined by him.Kids, Jackson, Ohio.For instance, many photographs of African-Americans were excluded by Stryker, especially if it showed them to looking affluent, something which went against the socioeconomic ideas of the time.Picking stringbeans near Cambridge, Maryland.This process was extremely controversial. Photographers who spent hours traveling around trying to find the perfect shot were dismayed when their negatives were ruined by Stryker’s hole puncher.Postmaster at Old Rag, Shenandoah National Park, Virginia.He would constantly criticize photographers for not focusing on the subject well or for taking too many photos of the same subject. As former photographer Ben Shahn once said, “Roy was a little bit dictatorial in his editing and he ruined quite a number of my pictures, which he stopped doing later. He used to punch a hole through a negative. Some of them were incredibly valuable.”Residents of Camden, Tennessee.Another photographer, Edwin Rosskam, stated, “The punching of holes through negatives was barbaric to me. I’m sure that some very significant pictures have in that way been killed off, because there is no way of telling, no way, what photograph would come alive when.”The association was filled with many talented photographers, most of whom are well-known today. Dorothea Lange, Walker Evans, Theodor Jung, and Arthur Rothstein, to name a few, ventured across the South to document life during these years. Stryker continued his hole punching trademark for years, until 1939 which he finally listened to the pleas of the photographers to stop ruining their work.Steelworker’s son, Pittsburgh, Pennsylvania.The pictures you see here are just a handful of the images that Stryker deemed to be of bad quality.While thousands of images might not have been used by Stryker, many of the ruined negatives were saved and digitized into the Library of Congress’ system. Many are also on view at the Whitechapel Gallery in London.Read another story from us: Horseback librarians during the Great DepressionThe images are an interesting window into the past and tell the intricate story of the lives of those who lived during this time, making them a true historic treasure.Rachel Kester is a freelance writer who has written for sites like 30A and Mystery Tribune and lives in the great state of Virginia.
Johnny Manziel made the money sign famous, but yesterday he had his signature move thrown back in his face after getting picked off by unknown defensive back Cleveland Williams in a spring developmental league practice.Williams isn’t the first to troll Manziel with his own move, but it’s still amusing. JFF may be a changed man, but the money sign is still going to be waiting for him every time he screws up for the rest of his career.Straight savagery!Cleveland Wallace (@CWallaceiii) picks off @JManziel2 and throws up the money sign afterward @TheSpringLeague pic.twitter.com/CyY1hvihP8— Jessica Morrey (@JessicaMorrey) April 3, 2018
Attend this free webinar and learn how you can maximize efficiency while getting the most critical things done right. Dimdim is about simplicity. From its name to its web conferencing software, the company strives for ease of use. “We want to democratize real-time, rich media collaboration,” says CEO DD Ganguly, who chose the name Dimdim not because of any relation to his first name, but because it’s memorable, easy to spell and has international appeal.Though officially based in Boston, Dimdim’s founders and board members live all over the world. Ganguly travels the most, splitting his time mainly between India, Boston and San Francisco, while co-founders Prakash Khot and Jayant Pandit live in Boston and Ottawa, Canada, respectively.The co-founders got the idea for Dimdim while brainstorming startup ideas from their far-flung locations. They were using Hotmail and Skype to communicate, but they needed more. They researched the web conferencing space, but were unhappy with expensive and complex legacy products and frustrated by the lightweight free ones–so they decided to build their own.They had already created a successful startup together–a company called Advanced Internet Management, which helped stabilize e-commerce sites and was acquired by Computer Associates in 2001. When they started Dimdim, all their initial employees came from the close-knit AIM team.With $500,000 out of pocket, the team launched Dimdim in 2006, offering free, browser-based web conferencing for up to 20 people. Users can share presentations, websites, videos, chat sessions and more on the open-source platform without having to download any software. If they want to share their screens, there’s a small download.There’s also a call-in number for those not using VoIP, and you can record the meeting for reference or sharing. For web conferencing with larger groups, there are paid Pro and Enterprise versions of the application. Users also pay a licensing fee to become partners and can customize Dimdim to their current systems. Dimdim has also opened up its API and invites developers to create new integrations for the product. Dimdim now integrates with CRM software that manages web conference contacts, as well as e-learning programs that present their lessons over Dimdim.Since 2007, Dimdim has received two rounds of funding totaling $8.4 million. To date, 1.7 million people have signed on to its web conferences, and Dimdim hopes to bring in $5 million in 2009.The company also continues to reap the benefits of its product internally when connecting its worldwide partners and employees. “We eat our own dog food,” Ganguly says. “By using Dimdim for board meetings, I calculated that we’ve saved about $250,000 in travel costs this year.” Register Now » Free Webinar | Sept 5: Tips and Tools for Making Progress Toward Important Goals March 4, 2009 3 min read