An Atropisomeric Chiral 2,2`-bipyridyl-3,3`-dicarboxylic Acid and Corresponding Platinum(II) Complex

Authors : Abdurrahman ŞENGÜL

Pages : 703-714

View : 16 | Download : 13

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :2,2`-Bipyridyl-3,3`-dicarboxylic acid insert ignore into journalissuearticles values(H2BDC); spontaneously resolves on crystallization from water, giving monohydrated crystals of the space group P212121. In any individual crystal, all the atropisomeric-skewed molecules are of one hand; however, on dissolution in water, optical activity is lost. Strong hydrogen bonding leads to a helical structure, via O--H ... N links, and 3 further strong bonds between water and carboxylate groups produce a framework structure. The pKa values measured for H2BDC insert ignore into journalissuearticles values(3.18 \pm 0.04 and 4.59 \pm 0.02 at 20 \pm 1 °C, in dilute aqueous solution); agree with the zwitterionic form. The reaction of H2BDC with potassium tetrachloroplatinateinsert ignore into journalissuearticles values(II); in water gives Ptinsert ignore into journalissuearticles values(H2BDC);Cl2 . H2O. The complex was characterized by elemental analysis and spectroscopic techniques.
Keywords : Platinum complexes, 3, 3` dicarboxyl 2, 2` bipyridine ligand, Crystal structure, Spontaneous resolution, Hydrogen bonding