title: Poly[diaquacobalt(II)-di-mu4-benzene-1,2,4-tricarboxylato-bis[1,10-phenanthrolinecobalt(II)]].
abstract: In the polymeric title compound, [Co(3)(btc)(2)(phen)(2)(H(2)O)(2)](n) [btc is the benzene-1,2,4-tricarboxylate trianion (C(9)H(3)O(6)) and phen is 1,10-phenanthroline (C(12)H(8)N(2))], there are two different Co centres, Co1 and Co2. The Co1 centre has a deformed trigonal-bipyramidal geometry, while the Co2 centre lies on an inversion centre and has distorted octahedral geometry. Moreover, the 1,2-dicarboxylate groups of one btc ligand bridge the two adjacent Co2 centres, and each Co2 centre is coordinated by four carboxylate O atoms from four different btc ligands, forming a novel kind of intersecting double-chain structure, with a Co.Co separation of 7.755 A, along the a axis. On the other hand, the two Co1 centres are bridged by two btc ligands and chelated by phen molecules, respectively, producing a binuclear unit with a Co.Co separation of 8.406 A, and these binuclear units are linked by btc bridges and Co2 centres to extend hybrid chains of Co1 and Co2 along the [101] direction. Furthermore, each btc ligand acts as a pentadentate bridge, linking the Co2 double-chain structures and the hybrid chains of Co1 and Co2 to yield a two-dimensional network, and this leads to the formation of very different kinds of voids.
authors.affiliation: Department of Chemistry and Material Science, Wenzhou Normal College, Wenzhou 325027, People's Republic of China.
authors.forename: Mao-Lin
authors.initials: ML
authors.lastname: Hu
authors.forename: Ji-Xin
authors.initials: JX
authors.lastname: Yuan
authors.forename: Hong-Ping
authors.initials: HP
authors.lastname: Xiao
authors.forename: Fan
authors.initials: F
authors.lastname: Chen