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In the polymeric title compound, [Co3(btc)2(phen)2(H2O)2]n [btc is the benzene-1,2,4-tri­carboxyl­ate trianion (C9H3O6) and phen is 1,10-phenanthroline (C12H8N2)], 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 Å, 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 Å, 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.

Document Type: Research Article

DOI: http://dx.doi.org/10.1107/S0108270104007851

Publication date: June 1, 2004

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