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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 applying the following geometrical restrains:
Chromium must have C.N. exactly 4 (T4).
Chromium is allowed to be coordinated by virtually any element of ...
5
An article by Bradley et al. [1] documents $\ce{[Cr(N(SiMe3)2)2(THF)2]}$ as a square planar complex. However, the $\ce{[Cr(N(SiMe3)2)3NO]}$ complex is pseudotetrahedral $(C_\mathrm{3v}).$
Figures below are provided by andselisk, the are from the reference above.
References
Bradley, D. C.; Hursthouse, M. B.; Newing, C. W.; Welch, A. J. Square Planar and ...
4
Most lanthanides display stability in their +3 oxidation states. Cerium does the same, which is why it has a very high reduction potential. The reduction potential for the $\ce{Ce^{4+}|Ce^{3+}}$ couple is 1.61 V (for comparison, $\ce{Cl2}$ has a potential of 1.32 V)
Cerium in the form of ceric ammonium nitrate is also quite stable compared to other ...
3
Wikipedia (primary reference) suggests a possible reason for $\ce{Fe2(CO)9}$ dissolving preferentially in THF versus nonpolar solvents: it reacts according to the scheme
$\ce{Fe2(CO)9 + THF <=> Fe(CO)5 + Fe(CO)4 \cdot THF}$
Such a reaction is invoked to account for the dinuclear complex giving mononuclear products with various ligands in THF. A ...
3
The reaction you wrote down is wrong on two counts. The reactant is not a hypothetical tetraaqua complex and the product is not a hypothetical tetraammin complex. The correct reaction is as shown below:
$$\ce{[Cu(H2O)6]^2+ (aq) + 4 NH3 (aq) <=> [Cu(NH3)4(H2O)2]^2+ (aq) + 4 H2O (l)}\tag{1}$$
Note that I have used an equilibrium arrow here: the ...
2
Yes, you are correct: an -ate prefix is used when the complex has a net negative charge and the name should be triamminetrinitritocobaltate(I) ion
Reference:
If the overall coordination complex is an anion, the ending "-ate" is attached to the metal center. Some metals also change to their Latin names in this situation. The rest of the metals simply have ...
1
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 the top right corner with charge being superscripted.
Since here both chloride anions are not ligands and don't belong to coordination sphere, they should be ...
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