Journal
COORDINATION CHEMISTRY REVIEWS
Volume 254, Issue 13-14, Pages 1468-1478Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.ccr.2009.11.011
Keywords
Polynitrile; Magnetic properties; Cyano ligand; Nitrile ligand; Coordination polymers; Metal(II) complexes; Magnetic transition; Structural transition; Thermochromism
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The use of polynitrile anions as ligands (L) either alone or in combination with neutral co-ligands (L') is a very promising and appealing strategy to get molecular architectures with different topologies and dimensionalities thanks to their ability to coordinate and bridge metal ions in many different ways. The presence of several potentially coordinating nitrile groups (or even other donor groups as -OH, -SH or -NH2), their rigidity and their electronic delocalization allow the synthesis of original magnetic high dimensional coordination polymers with transition metals ions. Furthermore, these ligands have shown coordinating and bridging capabilities in novel discrete and polymeric bistable materials (materials showing original magnetic behaviours or spin crossover (SCO) transitions). Here we report an overview of the results obtained with some of these modified polynitrile ligands, showing their rich coordination chemistry and their crucial role in new molecular materials exhibiting unusual magnetic transitions. (C) 2009 Elsevier B.V. All rights reserved.
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