Cobalt(ii/iii), nickel(ii) and copper(ii) coordination clusters employing a monoanionic Schiff base ligand: synthetic, topological and computational mechanistic aspects

Edward Loukopoulos,Vassiliki N Dokorou,Athanassios C Tsipis,Benjamin Berkoff,Kieran Griffiths,George E Kostakis,Albert Escuer,Victoria Keeble

doi:10.1039/c5ce01294e

Edward Loukopoulos, Vassiliki N Dokorou + Show 6 more

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https://doi.org/10.1039/c5ce01294e

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Abstract

Nine coordination clusters (M = CoII/III, NiII, CuII) using a monoanionic Schiff base ligand were synthesized and characterized. A series of transformations occur in the ligand in certain compounds.

Highlights

Despite the long history and activity of polynuclear metal complexes, known as coordination clusters (CCs),1 their coordination chemistry continues to be a field that attracts great interest today
CCs using ligands of this nature are of special importance and many examples of their applications in materials science,5–7 catalysis,8–12 biological processes,13–15 molecular magnetic materials,16–23 photochemistry,24,25 and nanostructure studies26,27 have been explored
We report the initial employment of HL1 in CoII,III, NiII and CuII chemistry and present the synthesis, characterization and crystal structure of nine CCs formulated as ijCoIIL12]·5MeCN (1·5MeCN), ijNiIIL12]·5MeCN (2·5MeCN), ijCuIIL12]·MeCN (3·MeCN), ijCoII4L14IJMeO)2]·2IJClO4) [4], ijCoII4L24IJH2O)4] [5], ijCoII4L34IJH2O)4] [6], ijCoIIIL1L4]·2MeCN (7·2MeCN), ijNiII2L13IJMeOH)]·IJClO4)·2MeOH (8·2MeOH), and ijCuII4L14IJMeO)2]·2IJClO4)·6MeOH (9·6MeOH) as well as the magnetic properties for representative compounds 4 and 8

Summary

Introduction

Despite the long history and activity of polynuclear metal complexes, known as coordination clusters (CCs), their coordination chemistry continues to be a field that attracts great interest today. Among the different categories of ligands used in this field, perhaps one of the most significant is Schiff bases, which have received a large amount of attention especially in the past decade. This is due to their wide range of useful properties such as strong biological activity, ease of access and versatile coordination abilities. Scheme 1 The protonated form of IJE)-4-IJ2-hydroxy-3-. The different transformations of the HL1 ligand observed in compounds 5–7 IJH2L2, H3L3, H2L4). Transformed organic molecules are presented in their protonated form

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