Characterization of the coordination properties of bis(3,5-dimethylpyrazole-1-carbodithioato)copper(II)

Silver(I) Pyrazolates. Synthesis and X-ray and 31P-NMR Characterization of Triphenylphosphine Complexes and Their Reactivity toward Heterocumulenes

“…In the case of copper(II) centers, the N 2 S 2 coordination was confirmed in 1978 by Bereman et al. on the basis of spectroscopic evidence. Recently, we reported the crystal structure of the product derived by reacting CS 2 with [Cu(dmpz)(RNC)] 2 (Hdmpz = 3,5-dimethylpyrazole, RNC = cyclohexyl isocyanide), showing the N,S coordination mode also for a rather soft metal center like copper(I) …”

Coordination chemistry of new sulfur-containing ligands. 16. Crystal and molecular structure of tris(pyrrole-n-carbodithioato)iron(III)-hemikis(dichloromethane), Fe(S2CNC4H4)3.0.5CH2Cl2, a low-spin dithiocarbamate complex of iron(III)

“…In recent years we have been interested in synthesizing new sulfur-containing ligands which promise to induce "unusual" electronic properties at the metal center.1, [3][4][5][6][7][8][9][10][11][12][13][14][15][16] With this in mind, we have recently investigated the coordination chemistry of several new dithiocarbamate ligands derived from the heterocyclic nitrogenous bases pyrrole, indole, carbazole, imidazole, and indoline. As a result of our extensive studies on the relationship between ligand resonance structure and metal bonding in the cyclopentadienedithiocarboxylate ligand1,3,4,6-8,10 (see Scheme I), we felt confident that certain specific resonance structures of these new dithiocarbamate ligands might dominate the metal-bonding scheme.…”

“…This suggests that there is considerable stability to the metal-sulfur linkages, probably as a result of extensive bonding. 14 The complex tris(pyrrole-A-carbodithioato)iron(III) is of particular interest because it remains a low-spin species through the range 4-400 K; it is also believed to contain a dithiocarbamate ligand tending toward structure V (or III).…”

Bis(3,5-dimethylpyrazole-1-carbodithioato) Nickel(II) and Its Transformation to a Dinuclear Complex: Crystal Structure of [Ni2(μ-3,5-Me2Pz)2(L1)2] (L1 = 3,5-dimethylpyrazole-1-carbodithioate)

“…2 The coordination properties of the ambidentate pyrazoledithiocarboate ligands and a preferential five-membered N,S chelate ring (I) formation compared to a four-membered S,S ring (II) has been known for some years. 3 The chemistry of sulfur-ligated nickel oxidation states has attracted a great deal of attention in recent years. 4 The complexation behavior of nickel by the simple dithiocarbamate ligands of secondary amines give the diamagnetic bis(dithiocarbamate) chelate Ni II (dtc) 2 .…”

“…The mononuclear NiN 2 S 2 complexes of bidentate N,S donor ligands show interesting structural, magnetic, and electrochemical properties and are relevant to the active site geometries of CODH . The coordination properties of the ambidentate pyrazoledithiocarboate ligands and a preferential five-membered N,S chelate ring (I) formation compared to a four-membered S,S ring (II) has been known for some years . The chemistry of sulfur-ligated nickel oxidation states has attracted a great deal of attention in recent years .…”