Spectroscopic and Electrochemical Properties of Cyclometalated Platinum(II) Compounds Containing cis-1,2-Dicyano-1,2-dithiolatoethene.

Mono and dinuclear half-sandwich platinum group metal complexes bearing pyrazolyl-pyrimidine ligands: Syntheses and structural studies

“…In the mononuclear complexes [3]PF 6 and [7]PF 6 the N1-metal distance (2.076 and 2.106 Å) of the pyrazolyl moiety is slightly shorter than the corresponding pyrimidinyl, N3-metal distance (2.092, and 2.138 Å), in contrast to complex [6]PF 6 in which the N1-metal (2.102 Å) distance is slightly longer than the corresponding N3-metal distance (2.093(2) Å). The Rh-N bond distance (2.106(3) and 2.138(3) Å) in 7 is slightly longer than the corresponding distances of ruthenium complex 3 (2.076(3) and 2.092(2) Å) and complex 6 (2.102 and 2.093), while the MÀCl [2.402(7), 2.388(8) and 2.400(6)] bond lengths show no significant differences in all the cations and similar reported values [55,56].…”

“…The dinuclear complex [18](PF 6 ) 2 shows a typical piano-stool geometry for the ruthenium atoms with the metal centers being coordinated by the aromatic ligand, a terminal chloride and a chelating N,N-ligand (Fig. 4) 6 , while the ruthenium-chlorine bond distances are comparable. In complex [18](PF 6 ) 2 , the isopropyl group of the p-cymene ligand at Ru1 center located opposite to the halide ligand in order to reduce steric interactions, while at Ru2 the isopropyl group is located on same side to the halide ligand.…”

“…Yield 6 were further reacted with half mole of arene ruthenium or Cp*Rh or Ir dimers in acetonitrile solution, no reaction took place and isolated as starting compounds. Also attempts to synthesize hetero-nuclear complexes by reaction of the mononuclear complexes with other metal atoms led to no reaction.…”

“…During the last few decades there has been great interest in the chemistry of transition metals associated with polydentate ligands with sp 2 -hybridized nitrogen atoms, for instance, polypyrazolylborates [1,2] and polypyridines [2][3][4][5][6][7][8][9][10]. In many cases the charge transfer properties of these compounds justify this interest.…”

Pd(II) Complexes with Polydentate Nitrogen Ligands. Molecular Recognition and Dynamic Behavior Involving Pd−N Bond Rupture. X-ray Molecular Structures of [{Pd(C6HF4)2}(bpzpm)] and [{Pd(η3-C4H7)}2(bpzpm)] (CF3SO3)2[bpzpm = 4,6-Bis(pyrazol-1-yl)pyrimidine]

“…Polydentate ligands with sp 2 -hybridized nitrogen atoms have been frequently used, for instance, polypyrazolylborates 1,2 and polypyridines. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] More related to the ligands of the present work, other aromatic polydentate N-donor ligands, such as TPT (2,4,6-tris-2-pyridyl-1,3,5-triazine) 17-27 andpyrazolylpyridines, [28][29][30][31][32][33][34][35][36][37][38] have also been the subject of many studies, especially chargetransfer studies and related properties. On the other hand, triazines [39][40][41][42] or pyrimidines 43,44 bearing pyrazol-1-yl substituents have received much less attention.…”