CRYSTAL-STRUCTURE OF IS(PYRIDINE-2,6-DICARBOXYLATO-N,O,O')HOLMIATE(III) HEPTAHYDRATE

is(pyridyne-2,6-dicarboxylato-N,O,O')holmiate(III) heptahydrate crysta llizes in the monoclinic space group P2(1)/c with a = 17.841(4) Angstr om, b = 10.142(2) Angstrom, c = 18.570(4) Angstrom, beta = 112.20(3)de grees and Z = 4. The crystal and molecular structure of the complex ha s been determined using X-ray diffraction data measured with MoKalpha radiation. The discrepancy factor R for this structure is 0.0316 for 3 542 diffractometer data. The Ho3+ ion is coordinated to three pyridine -2,6-dicarboxylate anions by the oxygen atoms of carboxylate groups an d nitrogen atoms of aromatic rings. The Ho-O distances are ranging fro m 2.381(4) to 2.408(4) Angstrom, and Ho-N distances from 2.463(5). to 2.478(5) Angstrom. The coordination polyhedron around the holmium(III) ion can be described as a tricapped trigonal prism with Delta = 0.029 Angstrom(2).