Two New Polymers Constructed from Bisdentate Function of the 4,4′‐Bipyridine and 4‐Sulfobenzoate

Two new 4‐sulfobenzoate coordination polymers based on the Zn²⁺/Cd²⁺/4‐sulfobenzoate/4,4′‐bipyridine system, [Zn(4,4′‐bipy) (H₂O)₄] (sb) (1), [Cd₂(4,4′‐bipy)₄(sb)₂(H₂O)₃] · 3H₂O (2) [4,4′‐bipy=4,4′‐bipyridine; sb=4‐sulfobenzoate dianion], have been prepared and characterized by IR, elemental analysis and single‐crystal X‐ray analysis. Their X‐ray crystal structures show that the two complexes belong to a orthorhombic system, Pca2₁ space group, a=12.1794(8) Å, b=11.3422(8) Å, c=14.7572(10) Å and a monoclinic system, C/c space group, β=101.161(2)°, a=12.4916(16)) Å, b=19.023(2) Å, c=23.501(3) Å for 1 and 2, respectively. Both of the complexes form 1‐D chains, while the arrangement of the 1‐D chains are different. In contrast to monodentate 4,4′‐bipy‐containing complexes reported in the literature, the bisdentate function for 4,4′‐bipy in 4‐sulfobenzoate transition metal system has not been reported up to now. Extensive hydrogen‐bonding interactions in the 2 complexes control their crystal packing and give rise to 3D extended supramolecular networks.

Keywords:

• 4‐sulfobenzoate
• 4,4′‐bipyridine
• crystal structure
• hydrogen bond

This work was supported by the Natural Science Foundation of China (No. 20471026) and the Foundation of Education Committee of Henan province (No. 2006150017).