[Ca(dipicH2)(OH2)3][Ce(dipic)3]·5H2O: A One-Dimensional Coordination Polymer with Alternating CeN3O6 and CaNO7 Polyhedra (dipicH2 = Pyridine-2,6-dicarboxylic Acid)

The reaction of (NH 4 ) 2 Ce(NO 3 ) 6 and CaCl 2 with dipicH 2 resulted in the title compound ( 1 ). 1 crystallizes in the triclinic system, space group P 1̄, with a = 11.234(2) Å, b = 12.719(4) Å, c = 16.142(4) Å, α = 95.63(2)°, β = 103.73(2)°, γ = 113.83(2)°, and Z = 2. The structure consists of Ce(dipic) 3 2 - and Ca(dipicH 2 )(OH 2 ) 3 2+ ions linked by carboxylate groups forming an infinite linear chain having alternating tricapped trigonal prismatic and square antiprismatic polyhedra.