Timeline for Can molecule have just h-bonds between its parts
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| Feb 20, 2021 at 9:11 | history | edited | andselisk♦ |
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| Dec 4, 2020 at 16:18 | vote | accept | ademchenko | ||
| Dec 4, 2020 at 13:23 | answer | added | matt_black | timeline score: 4 | |
| Dec 4, 2020 at 12:04 | comment | added | Alchimista | Just to smooth thingd, as you likely aren't puzzled anymore. If you don't consider H-bond as a truly chemical bond, then no molecule can be held by only H-bonds. Conversely, there can be so many of them, that their breaking becomes difficult That would be a special case. For most of the case and depending on the function under discussion you can refer to DNA as one molecule of it. But this won't pose any problem to those seriously discussing molecules, DNA, proteins or whatever ensemble having a chemical physical identity. | |
| Dec 4, 2020 at 11:42 | comment | added | ademchenko | Sam, IvanNeretin, thank you, guys, for your answers! | |
| Dec 4, 2020 at 11:20 | comment | added | Amirreza Mousavi | WIKIPEDIA : A hydrogen bond (often informally abbreviated H-bond) is a primarily electrostatic force of attraction between a hydrogen (H) atom which is COVALENTLY BOUND to a more electronegative atom or group, particularly the second-row elements nitrogen (N), oxygen (O), or fluorine (F)—the hydrogen bond donor (Dn)—and another electronegative atom bearing a lone pair of electrons—the hydrogen bond acceptor (Ac) | |
| Dec 4, 2020 at 11:19 | comment | added | Amirreza Mousavi | @ademchenko yes. Still I've heard in inorganic chemistry there are some exceptions . In any of these exceptions at least one covalent bond is present. HF usually appears as multimers with hydrogen bonds. BH3 usually exists as BH3 - BH3 . BH3 molecule does not exist by itself . (this is not hydrogen bond though). PLUS the definition of hydrogen bond always requires 2 polar covalent bonds having H. therefore you can not have hydrogen bonds in the absence of covalent bonds in any way. | |
| Dec 4, 2020 at 10:57 | comment | added | ademchenko | @Sam, I'm sorry about that, I'm really confused because of my lack of knowledge. But do you mean that polymeric molecule is not a molecule by definition? I know what the polymeric molecule is but I thought it is a type of molecule. So, I thought the term "molecule" suits "polymeric molecule" as well. So, according to what you have said could we say that: the only type of molecule which parts can be connected by exclusively h-bonds (no covalent bonds are presented) is the polymeric one? | |
| Dec 4, 2020 at 10:50 | comment | added | Amirreza Mousavi | @ademchenko 1)True 2)NO. DNA is a polymeric macro molecule, It is consisted of 2 strands connected by Hydrogen bonds. Each Strand is also a polymeric macro molecule. therefore the term "molecule" results from covalent bonds of phosphodiester in each strand. I suppose you're not familiar with proteins 4 types of structure see : en.wikipedia.org/wiki/Protein_structure. The hydrogen bonds are created in 2nd, 3rd , 4th structure of a protein but 1st structure ALWAYS contains ONLY covalent bonds.Almost the same thing goes with DNA. 3) Because H2O**H2O is not polymer as DNA is. | |
| Dec 4, 2020 at 10:47 | comment | added | Ivan Neretin | The definition you quoted is official enough to me. But it is not complete. You may look for the complete one; you may even found some, but they won't be complete either. There are always borderline cases. You are looking for strict formal criteria where there are none. | |
| Dec 4, 2020 at 10:28 | comment | added | ademchenko | @IvanNeretin, then what definition is correct and/or official? Are there any formal parameters to split between the case of two water compounds and DNA strands? Maybe, the number of h-bonds or some kind of h-bonds total strength or something like this? | |
| Dec 4, 2020 at 9:32 | comment | added | Ivan Neretin | In short: (1) Yes. (2) Depends on the definition. (3) Because there are pretty many of them in one DNA strand. | |
| Dec 4, 2020 at 9:18 | review | First posts | |||
| Dec 4, 2020 at 9:19 | |||||
| Dec 4, 2020 at 9:17 | history | asked | ademchenko | CC BY-SA 4.0 |