Timeline for Why is an S-S bond stronger than an O-O bond?
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13 events
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| Jun 26, 2021 at 11:02 | comment | added | Deepak Arya | @orthocresol I was just wondering about typical Si-O single bond enthalpy in any compound with typical C-O bond enthalpy. I was not talking about diatomic species but single bonds as we encounter them in alcohols or Me3SiCN rxn with ketones. There the reasoin for forward rxn was given as a strong Si-O bond. Then I looked at this page (wiredchemist.com/chemistry/data/bond_energies_lengths.html) and it shows Si-O bond energy around 100KJ/mol higher than C-O bonds. Which seems weird. Either the page is wrong Or should I envoke oxygen lone pair going to empty d-orbitals of Si ;). | |
| Jun 26, 2021 at 10:38 | comment | added | orthocresol | @DeepakArya No. To get to the same MO diagram as above, you’d need to put so many more electrons onto carbon (or silicon), which doesn’t make sense chemically; no real compound has a carbon with a 3- charge. You need some other reason for that, and let me warn you against using “silicon d-orbitals” as the reason. | |
| Jun 26, 2021 at 10:08 | comment | added | Deepak Arya | @orthocresol Can the same argument be used for weaker C-O single bond (~ 350KJ/mol) compared with Si-O single bond (~ 450KJ/mol)? (if you are still here, otherwise I will post a new question.) | |
| Sep 26, 2017 at 22:47 | comment | added | orthocresol | It's tempting to think that bonding character arises from electron-nuclear attraction and antibonding character from electron-electron repulsion, but it's not so simple. All factors (kinetic energy, potential energy) play a role in orbital energies. Even a physical explanation of why H2 is stable (i.e. why is a covalent bond stable?) isn't easy (see e.g. J. Phys. Chem. A 2013, 117, 7946), so I don't imagine it's any simpler in O2. My direct answer to your question, therefore, is "I don't know". | |
| Sep 26, 2017 at 15:08 | comment | added | Tan Yong Boon | How do we physically explain the greater antibonding nature of antibonding pi orbitals in the O-O bond? Is it due to the inter-electronic repulsions between the two dense electron clouds of the two oxygen atoms? | |
| Apr 13, 2017 at 12:57 | history | edited | CommunityBot |
replaced http://chemistry.stackexchange.com/ with https://chemistry.stackexchange.com/
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| Oct 9, 2016 at 20:20 | vote | accept | M.A.R. | ||
| Oct 1, 2016 at 0:28 | history | bounty ended | Jan | ||
| Sep 24, 2016 at 13:33 | history | edited | orthocresol | CC BY-SA 3.0 |
cleanup; rewrote and reorganised quite a few sections, added BDE data
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| Apr 22, 2016 at 21:07 | history | edited | orthocresol | CC BY-SA 3.0 |
reorganised and elaborated on some aspects
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| Apr 16, 2016 at 19:43 | history | edited | orthocresol | CC BY-SA 3.0 |
deleted 32 characters in body
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| Apr 15, 2016 at 5:01 | vote | accept | M.A.R. | ||
| Sep 24, 2016 at 14:47 | |||||
| Mar 28, 2016 at 20:14 | history | answered | orthocresol | CC BY-SA 3.0 |