Three new Cu II /3-sb/2,2 0 -bipy complexes, [Cu(2,2 0 -bipy) 2 (3-sb)]AE4 H 2 O (1), {[Cu(2,2 0 -bipy)(3-sb)(H 2 O) 2 ]AE2. 5H 2 O} n (2), and
have been synthesized by hydrothermal reactions or the combination of hydrothermal reactions and solution evaporation. The molecular structure of complex 1 is a monomer in which the 3-sb monodentately coordinates to the Cu II ion. Complexes 2-4 exhibit one-dimensional infinite chain structures in which the 3-sb ligands serve as bridges. Complex 5 is a cation-anion species in which the 3-Hsb is non-coordinating. Five complexes exhibit four coordination geometries, irregular geometry between square pyramid and trigonal bipyramid in 1, distorted octahedron in 2, square pyramid in 3-4, and trigonal bipyramid in 5. These complexes contain lattice and/or coordinated water molecules, therefore extensive hydrogen bonds occur. The extended hydrogen-bonding architectures are 1-D chains for 4 and 5, 2-D layers for 1 and 3, and 3-D network for 2. Complexes 3 and 4 have same crystal system and space group, and afford similar 1-D frameworks but have different lattice water molecules, therefore the addition lattice water molecule in complex 3 leads to more compact packing, longer metal-lattice water distance, and shorter CuÁ Á ÁCu separation by 3-sb compared to those in complex 4. The fluorescent emissions of complexes 1-3 are stronger than those of ligands, indicating the coordination of 3-sb and 2,2 0 -bipyridine can enhance the emissions.