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Two new compounds belonging to the family of bis(dithiooxalato)nickelate(II) complex anion with the general formula [(C 6 H 5 ) 4 X] 2-  [Ni(S 2 C 2 O 2 ) 2 ], where X = P (NIDTP) and As (NIDTAS), have been synthetized. Crystal structure analyses of these compounds show that both crystallize in the triclinic system, space group is  P [unk] with  Z  = 2. Crystal data for NIDTP are:  a  = 11.050(5),  b  = 13.263(7),  c  = 18.385(8) Å,  α  = 111.97(5),  β  = 90.49(5),  γ  = 106.10(4)°,  V  = 2382(2) Å 3 ,  F (000) = 1012,  D x   = 1.364,  D  0  = 1.37(1) Mg·m −3 ,  R  = 0.040 and  R w   = 0.046 for 6732 observed reflections; for NIDTAS:  a  = 10.446(5),  b  = 17.525(8),  c  = 14.07(4) Å,  α  = 91.20(9),  β  = 100.8(1),  γ  = 88.28(4)°,  V  = 2528(7) Å 3 ,  F (000) = 1084,  D x   = 1.400,  D  0  = 1.40(1) Mg·m −3 ,  R  = 0.112 and  R w   = 0.124 for 2174 observed reflections. While the asymmetrical unit of the compound NIDTP contains one discrete complex [Ni(S 2 C 2 O 2 ) 2 ] 2−  anion, in general position, and two [(C 6 H 5 ) 4 P] +  cations, the asymmetrical unit of NIDTAS consists of two centrosymmetric [Ni(S 2 C 2 O 2 ) 2 ] 2−  anions and two [(C 6 H 5 ) 4 As] +  cations. In both cases the organic cations and anions are linked by electrostatic interactions and hydrogen contacts of type C – H … O.

zeitschrift für kristallographie

Dithiooxalate ligand complexes. Crystal structure and bonding of tetraphenylarsonium and tetraphenylphosphonium salts of the bis(dithiooxalato)nickelate(II) anion