New Heterobimetallic Ion-pair Complexes of Ni(II) with Mn(II), Co(II) and Zn(II)

ABSTRACT

Some heterobimetallic ion-pair complexes of Ni(II) with Mn(II), Co(II) and , Zn (II) using 1,10-phenanthroline (phen) and 1-tert-butylimidazole-2-thione (tm^t-Bu) ligands were prepared by co-crystallization of Ni(II)-phen cationic complex and Cl- / tm^t-Bu containing anionic complex in acetonitrile / methanol solvent. The [Ni(phen)₃][MnCl₄] (1) contains two molecule of acetonitrile and [Ni(phen)₃] ²⁺ is hydrogen bonded with [MnCl₄] ^-2. [Ni(phen)₃].2[Co(tm^t-Bu)Cl₃] (2) contains two molecule of acetonitrile and [Ni(phen)₃]²⁺ is hydrogen bonded with two molecule of [Co(tm^t-Bu)Cl₃] ^1-. The [Ni(phen)₂(tm^t-Bu)Cl)][Zn(tm^t-Bu)Cl₃] (4) has both acetonitrile and methanol as solvent of crystallization and [Ni(phen)₂ (t^t-Bu)Cl)]⁺ is hydrogen bonded with [Zn(t^t-Bu)Cl₃] ^1- anion. All of these complexes have been characterized by magnetic measurement, thermal analysis and single crystal X-ray diffraction technique. The presence of different non-covalent interactions including π-π stacking in these complexes resulted the formation of three-dimensional supramolecular architecture. These complexes show no magnetic interaction as the distances between the metal ions present there in is too large.

Keywords:

1, 10-phenanthroline, cationic-anionic complexes, thioimidazole, crystal structure, magnetic properties.