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Results tagged with coordination-compounds
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user 41328
This tag is for questions concerning coordination compounds including but not limited to ligand properties, metal properties, orbital splitting, micro- and macroscopic properties of entire complexes etc. For complexes where carbon monoxide is the only ligand, use the [carbonyl-complexes] tag instead. For organic catalysts or proteins, the tag is applicable if the question is about the metal’s direct coordination sphere.
6
votes
Why is thiourea a monodentate ligand?
This is not really a standalone answer, rather a pointer or an exeption. There are few complexes where deprotonated thiourea $\ce{S=C(NH2)NH}^-$ acts as a bidentate ligand. One example is (aminomethan …
- 38.5k
13
votes
Proper common notation for a ligand
The ACS Style Guide suggests using $\ce{L}$ [1, p. 186] in APPENDIX 10-2 Abbreviations, Acronyms, and Symbols:
\begin{array}{ll}
[\ldots] & \\
\small{L} & \text{absolute configuration} \\
\mathrm{L …
- 38.5k
13
votes
How is the bonding in the [Au6C(PPh3)6]2+ cluster explained?
This is by no means a trivial case.
You are dealing with a so-called template or interstitial atom placement within a cluster shell.
There is a thorough review available [1, pp. 18–20] (reference numb …
- 38.5k
4
votes
Coordination number of chromium(III) oxalate complex
This seems to be the case of "show, don't tell".
IUPAC's definition of coordination number (C.N.) which applies to inorganic complexes:
In an inorganic coordination entity, the number of σ-bonds …
- 38.5k
2
votes
Oxidation states of iron in Roussin's salts
I suppose it's asked about formal oxidation numbers of iron as there is not enough information to make assumptions about the ones that reflect electronic structure.
For instance, analysis of interatom …
- 38.5k
9
votes
Accepted
IUPAC name of H[AuCl4]
The authoritative source Nomenclature of Inorganic Chemistry, IUPAC Recommendations 2005 (Red Book) lists $\ce{H[AuCl4]}$ as an example of a salt in the subsection IR-4.4.3.4 Generalized salt formulae …
- 38.5k
12
votes
Do ligands with a positive charge exist?
In addition to already mentioned cationic onium ligands, there is hydrazinium $\ce{H2N-NH3+}$ and its derivatives [1 -- 3].
Crystal structure of hydrazinium-trichloro-copper(II) $\ce{Cu(N2H5)Cl3}$ [ …
- 38.5k
3
votes
What is the structure of [Co(NH3)5SO4]+?
Interestingly enough, it seems that crystal structure of $\ce{[Co(NH3)5(SO4)]+}$ has not yet been obtained. Probably it has something to do with trans-effect of $\ce{SO4^2-}$, which makes $\ce{NH3}$ l …
- 38.5k
14
votes
Can an atom bond with more than 8 other atoms?
In october 2015, 5 months after all the current answers were given, a new cluster compound witn C.N. 16, $\ce{CoB16-}$, has been reported [1]:
Here we report the observation of a large metal-doped …
- 38.5k
17
votes
Accepted
How to name Hg[Co(SCN)4]?
TL;DR: There is no inner- or outer coordination spheres in this complex. Both cobalt(II) and mercury(II) have nearly ideal tetrahedral coordination environment with $4$ $\ce{N}$ and $4$ $\ce{S}$ atoms …
- 38.5k
10
votes
Accepted
Naming this iron complex: Fe2Cl6[H2O]5
In coordination chemistry square brackets denote inner coordination sphere; $\ce{[H2O]5}$ makes little sense in this context.
It looks like the correct molecular formula for this compound appears to b …
- 38.5k
2
votes
Accepted
Confused on how to draw cis-[Ni(H2O)4(NH3)2]Cl2
A structure of a coordination complex with properly assign wedged bonds for depicting stereochemical features should be be either fully enclosed in square brackets or denoted with an L-shaped brace on …
- 38.5k
8
votes
How many bonds can nitrogen form?
I'd like to try answer the question from the title regarding the maximum number of atoms nitrogen is capable of bonding with, and also slightly expand my comment.
Metal nitrido complexes are commonly …
- 38.5k
8
votes
Can Fe(CO)5 adopt both square pyramidal and trigonal bipyramidal geometries?
The most recent single crystal structure investigation (high precision, $R_1 = 1.9\%$, $wR_2 = 5.7\%$) of molecular iron pentacarbonyl [1] suggests trigonal bipyramidal coordination environment (also …
- 38.5k
8
votes
Chromium cyanide complexes
This doesn't appear to be a rare case and there are plenty $\ce{Cr^2+}$ square planar complexes.
I found 15 square planar complexes with well-determined crystal structures $(R_\mathrm{int} < 10\%)$ by …
- 38.5k