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.
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