STRUCTURAL CONSEQUENCES OF M-CL-CENTER-DOT-CENTER-DOT-CENTER-DOT-H-N HYDROGEN-BONDS IN SUBSTITUTED PYRIDINIUM SALTS OF THE COBALT(II)TETRACHLORIDE ANION ISOLATED FROM LIQUID CLATHRATE MEDIA

The crystal and molecular structures of two substituted pyridinium sal ts of the cobalt(II)tetrachloride anion, [4-picolinium](2)[CoCl4] 1 an d [4,4'-Bipyridinium][CoCl4] 2, isolated from liquid clathrate media a re reported in order to gain an understanding into the preferred orien tation adopted by such interacting moieties. We demonstrate that M-Cl ... H-N hydrogen bonds principally govern the solid-state self-assembl y of these systems. Furthermore, rye reveal that 1 possesses the first noted example of a dimeric three-center hydrogen bond.