FORMATION OF 2-PYRIDINYL-2-OXAZOLINES IN THE COORDINATION SPHERE OF COPPER(II) AND COBALT(II) - THE CRYSTAL-STRUCTURE OF (2-PYRIDINYL)-4,4-BIS(HYDROXYMETHYL)-2-OXAZOLINE)] COPPER(II) BROMIDE HEMIHYDRATE

The reaction of pyridine-2-carbonitrile (2-CNpy) with 2-amino-2-hydrox ymethyl-1,3-propanediol (AL(1)), 2-amino-2-methyl-1,3-propanediol (AL( 2)) and 2-amino-2-methyl-1-propanol(AL(3)) in ethanolic solutions of C u(II) and Co(II) salts led to the formation of solid complexes contain ing 2-(2-pyridinyl) -4,4-bis (hydroxymethyl)-2-oxazoline (pyoxaL(1)), 2-(2-pyridinyl)-4-hydroxymethyl-4-methyl (pyoxaL(2)) and 2-(2-pyridiny l)-4,4-dimethyl-2-oxazoline (pyoxaL(3)), respectively. Their stereoche mistry and the mode of ligand coordination have been determined by spe ctral, magnetic and conductometric measurements. The crystal structure of [CuBr(2-(2-pyridinyl) -4,4-bis (hydroxymethyl) -2-oxazoline)(2)] B r . 0.5H(2)O was determined by X-ray diffraction technique. The influe nce of Cu(II) and Co(II) salts on the formation of 2-pyridinyl-2-oxazo lines is briefly compared with that of Ni(II) salts. (C) 1998 Elsevier Science Ltd. All rights reserved.