Supramolecular terbium-SIP complex pillared by 4,4′-bipyridyl, {[Tb(SIP)(H2O)5]2(bpy)3(H2O)}n:: Synthesis, crystal structure and photoluminescence

The supramolecular terbium complex, {[Tb(SIP)(H2O)(5)](2)(bpy)(3)(H2O)}(n) (NaH2SIP = 5-sulfoisophdialic acid monosodium salt and bpy = 4,4'-bipyridyl), has been synthesized by the hydrothermal reaction of Tb4O7 with NaH2SIP and bpy at 165 degrees C, and characterized by single-crystal X-ray diffraction, elemental analysis, IR spectrum, powder X-ray diffraction and photoluminescence spectrum. It crystallizes in a monoclinic system, space group C2/c, with a = 30.6840(1), b = 10.9206(2), c = 17.4967(3) angstrom, beta = 111.931(1)degrees, V = 5438.65(14) angstrom(3), Z = 4, C46H52N6O25S2Tb2, M-r = 1470.90, D-c = 1.796 /gcm(3), mu = 2.747 mm(-1), F(000) = 2928, the final R = 0.0654 and wR = 0.1322 for 3806 observed reflections with I > 2 alpha(I). In the neutral [Th(SIP)(H2O)(5)](2) motif, the Tb(III) ions are linked by the SEP ligands to form a one-dimensional zigzag chain propagating along the c axis. The zigzag chains are linked together by hydrogen bonds and pi-pi stacking interactions to form a two-dimensional supramolecular framework. The uncoordinated bpy molecules act as pillars to extend the two-dimensional sheets into a distinctive pillared three-dimensional supramolecular structure through O-H center dot center dot center dot N hydrogen bonds. The photoluminescence of the complex was investigated at room temperature in the solid state.