Crystal Structures and Photoluminescence Properties of Zinc(II) and Cadmium(II) Coordination Polymers with "Y"-Shaped Ligands

Three Zn-II and Cd-II complexes with Y-shaped dicarboxylate ligands, namely [Zn(L-1)(2,2 '-bpy)(2)(H2O)]center dot 2H(2)O (1), [Zn(L-1)(bpp)(H2O)] (2), and [Cd(L-1)(H2O)]center dot H2O (3) [H2L1 = N-phenyliminodiacetic acid, 2,2 '-bpy = 2,2 '-bipyridine, bpp = 1,3-bis(4-pyridyl)propane] were synthesized and characterized by elemental analysis, IR spectroscopy single-crystal X-ray diffraction, and thermogravimetric analyses. Compound 1 shows an hydrogen-bonded 2D network, whereas compound 2 is an infinite 1D wavy chain structure, though O-H center dot center dot center dot O hydrogen-bonded to form a 2D network. Compound 3 displays a 2D uninodal 3-connected Shubnikov plane net with the point symbol of (4.8(2)). Moreover, the solid-state such as thermal stabilities and fluorescence properties of 1-3 were also investigated.