Synthesis, Crystal Structures and Thermal Stabilities of [Cu(bpp) 2 (bpdc)(H 2 O) 2 ] n ·2 n H 2 O and [Cu(bpp) 2 ] n · n (tdc) ·7.5 n H 2 O

Two novel copper(II) coordination polymers [Cu(bpp) 2 (bpdc)(H 2 O) 2 ] n · 2 n H 2 O ( 1 ) and [Cu(bpp) 2 ] n · n (tdc) · 7.5 n H 2 O ( 2 ) (H 2 bpdc=biphenyl‐4,4′‐dicarboxylic acid, bpp=1,3‐di(4‐pyridyl)propane and H 2 tdc=thiophene‐2,5‐dicartboxylic acid) have been synthesized by the reactions of Cu(NO 3 ) 2 and bpp with the H 2 bpdc or H 2 tdc, respectively at room temperature . In the complexes 1 and 2 , their Cu atoms have a distorted octahedral geometry, and two water molecules coordinate weakly to the Cu atom in the long axial direction. Both complexes have one‐dimensional linear polymer structures. In complex 1 , both carboxylate groups of the bpdc can coordinate to Cu atom, while both carboxylate groups of the tdc dianion in complex 2 do not coordinate to the Cu atom, which only balance the charge. In the both complexes, the bpp ligand has different conformation: trans ‐ trans in complex 1 and trans ‐ gauche in complex 2 . The thermal gravimetric analyses indicate that both complexes are stable under 110 and 160 °C, respectively.