Catena-Poly[[tetra-aqua-nickel(II)]-?-(9,10-dioxo-9,10-dihydro-anthracene-1,4,5,8-tetra-carboxyl-ato)-?(2)O(1):O(8)-[tetra-aqua-nickel(II)]-?-4,4'-bipyridine-?(2)N:N'].

ABSTRACT: In the crystal of the title polymeric complex, [Ni(2)(C(18)H(4)O(10))(C(10)H(8)N(2))(H(2)O)(8)](n), each Ni(II) cation is coord-in-ated by four water mol-ecules in the equatorial plane, and is further bridged by an 9,10-dioxo-9,10-dihydro-anthracene-1,4,5,8-tetra-carb-oxy-l-ate anion and a 4,4'-bipyridine ligand in the axial directions, forming a distorted octa-hedral geometry. The 9,10-dioxo-9,10-dihydro-anthracene-1,4,5,8-tetra-carboxyl-ate anion is centrosymmetric with the centroid of the quinone ring located about an inversion center; the 4,4'-bipyridine ligand is also centrosymmetric with the mid-point of the C-C bond linking two pyridine rings located about another invertion center. The 9,10-dioxo-9,10-dihydro-anthracene-1,4,5,8-tetra-carboxyl-ate anion and bypiridine ligand bridge the Ni(II) cations, forming a polymeric chain along the b axis. ?-? stacking is observed between pyridine and benzene rings [centroid-centroid distance = 3.705?(2)?Å]. All of the coordinating water mol-ecules are involved in O-H?O hydrogen bonding.

SUBMITTER: Liu YM 

PROVIDER: S-EPMC3393213 | biostudies-literature | 2012 Jul

REPOSITORIES: biostudies-literature