Crystal and molecular structure of zinc dithizonate

Studies on stabilities of nickel(II) and zinc(II) complexes of substituted diphenylcarbazones and thiocarbazones

“…Here again, the spectra of the metal complexes in both chloroform and aqueous dioxan are very similar. In accordance with our earlier observations (1)(2)(3)(4), nickei(II) complexes exhibit multiple absorption bands characteristic of charge-transfer complexes and zinc(II) complexes show a single intense peak around 500 nm.…”

“…For many years (1)(2)(3)(4), the structural Interpretation of the properties of metal complexes of diphenylcarbazone (DPC), diphenyithiocarbazone (DPTC), and their various analogues has received considerable attention. In continuation of this work, we have now undertaken a systematic study of the influence of electron-withdrawing substituents on the formation constants of the complexes of nickeKII) and zlnc(II) with substituted DPC and DPTC.…”

Crystal structure of indium(III) dithizonate

“…* A number of forms are possible for these complexes given that the dithizonate ion may exist in tautomeric forms, both of which might give rise to linkage isomers (Figure 2). Crystallographic studies are an obvious means of resolving such ambiguities and indeed available data [3][4][5][6][7][8] suggest that form (A) must be strongly prefer-Zd, since it is observed in all known cases.? However, it is not apparent that these results can be regarded as an adequate characterisation of the coordination properties of dithizonate ligand, since they refer to metals in a single oxidation state and with, in most cases, low co-ordination numbers.…”

Dichloro [1,5‐diphenylcarbazonato‐N,N′]dimercury (II), C13H10N4OHg2Cl2

“…Although all estimates of the bond character should be treated very carefully because of the poor reliability of the interatomic distance parameters (conventional R = 11.4 % ) , the bond orders following the Burke-Laing and Laing criteria (1976) for sp2 hybridisation involving carbon and nitrogen atoms correspond with a localised single bond for C(2)-Ni2) and with a localised double bond for N(l)-N(2). In view of these rather surprising results it has to be noticed that the lack of conjugation of the phenyl ring with the rest of the chelate molecule and the double bond character of the N(l)-N(2) bond have already been found in the structure of zinc dithizonate (N(l)-N(2) = 1.281 (1) Math and Freiser (1971). This structure determination gives by far the most precise bond order data for the N-N and N-C linkages in the chelate ring of primary dithizone complexes (cf.…”