Polynuclear cobalt(II/III) sulfites: synthesis, structure, and magnetic properties of the octanuclear cluster (NH4)11(Li subset[Co4IICo4III(SO3)16(NH3)8]).10H2O encapsulating a lithium cation

George I Chilas; Marios Stylianou; Maciej Kubicki; Tiverios Vaimakis; Paul Kögerler; Anastasios D Keramidas; Themistoklis A Kabanos

doi:10.1021/ic8004213

Polynuclear cobalt(II/III) sulfites: synthesis, structure, and magnetic properties of the octanuclear cluster (NH4)11(Li subset[Co4IICo4III(SO3)16(NH3)8]).10H2O encapsulating a lithium cation

Inorg Chem. 2008 Jun 2;47(11):4451-3. doi: 10.1021/ic8004213. Epub 2008 May 1.

Authors

George I Chilas¹, Marios Stylianou, Maciej Kubicki, Tiverios Vaimakis, Paul Kögerler, Anastasios D Keramidas, Themistoklis A Kabanos

Affiliation

¹ tkampano@cc.uoi.gr.

PMID: 18447337
DOI: 10.1021/ic8004213

Abstract

Partial oxidation of an aqueous solution of CoIICl(2).6H2O with (NH4)6[Mo7VIO24].4H2O in the presence of (NH4)2SO3.H2O and LiCl, at pH approximately 5.3, leads to isolation of the octanuclear cluster (NH4)11(Li subset[Co4IICo4III(SO3)16(NH3)8].10H2O), 1. The structure of the anion of 1 consists of a central [Co4II], almost ideal square planar unit, and a pair of symmetry-related CoIII dimers above and below the Co4II plane grafting onto the tetramer by 16 bridging sulfite groups. The [Co8(SO3)16(NH3)8]12- cluster encapsulates a lithium cation which lies at the center of the Co4II square.