Synthesis and Crystal Structure of a New Pr(III)-K(I) Heterometallic Oxalate Coordination Polymer

A new 3D heterometallic coordination polymer, namely [K2Pr2(C2O4)(4)center dot H2O](n) (1), has been successfully synthesized under hydrothermal conditions. X-ray single-crystal diffraction determination reveals that 1 crystallizes in monoclinic system, space group P2(1)/n with a =12.060(4), b = 8.493(3), c = 15.776(5) (angstrom), beta = 93.235(3)degrees, V = 1613.4(9) angstrom(3), Z = 4, M-r = 730.12, D-c = 3.006 Mg/m(3), mu = 6.581 mm(-1), F(000) = 1368, the final R = 0.0283 and wR = 0.0866 for 2939 observed reflections with I > 2 sigma(I). Complex 1 features an unusual 3D heterometallic coordination framework, in which oxalates exhibit three different coordination behaviours. Moreover, powder X-ray diffraction and thermal properties for 1 have also been investigated.