Structural motifs and topological representation of Mn coordination clusters

Abstract

Polynuclear coordination clusters have become of particular interest in recent times as a result of their relevance to bioinorganic chemistry and to the special area of molecule-based magnetic materials where cluster compounds behave as single-molecule magnets (SMMs). In this review we have focused on describing Mn coordination cluster complexes. Adopting our topological approach for the description of coordination clusters we present a means of classifying the structural motifs found in manganese clusters which range in nuclearity from 5 to 84, as well as some representative heterometallic Mn-M (M = K, Na, Ca, Sr, Ln) cluster complexes that have been reported. This sheds new light on the classification of the types of core structure accessible which, in turn, provides a useful means for developing the so-far missing magneto-structural correlation algorithm for these finite 0-D systems (212 references).

High-nuclearity cobalt coordination clusters: Synthetic, topological and magnetic aspects

“…The next section is introductory; the reader can find general information on the class of metal complexes known as clusters or better as "coordination clusters (CCs)" [3]. In section 3 we shall give the central idea of our new approach [2 -5] to describing the topology of polynuclear complexes.…”

“…Most of the clusters do not seem to correspond in a straightforward manner to polyhedral archetypes or to fragments of common Co minerals, but display a richness of nuclearities and topologies that is intriguing. The wide employment of our improved topological approach [2][3][4][5]80] to categorizing cluster topologies seems to give a significant tool in understanding that some structural motifs of higher nuclearity clusters are built up from motifs of CCs with lower nuclearity. This benefit will undoubtedly open new horizons in synthetic cluster chemistry and help scientists understand relationships between structural motifs and magnetic properties.…”

“…51. The simplified core 3,3,3,4,4,4,5M14-1 M a n u s c r i p t [3,28], where H 3 L is 2,6-bis(hydroxymethyl)-4-methylphenol, possessing an analogous motif, shows a difference due to M a n u s c r i p t the presence of two μ 6 -O 2-groups in 101 which offers six additional links (blue lines in Fig. 53).…”

A novel Cu5II cluster-based 3D magnetic framework with an overall S= 1/2 spin ground state

“…Very recently, rational design and controllable assembly of polynuclear metal-cluster based coordination polymers (MCCPs) are of great interest owing to their aesthetically pleasing structures, intriguing topologies as well as the promising applications in optoelectronics [1], magnetism [2], and porous materials [3]. Among diverse core-formation ligands with typically chelating groups such as polyazole [4,5], azide [6], carboxylate group [7] and so on, conjugated aromatic polycarboxylate ligand can be regarded as one of good candidates for MCCPs.…”

Field-Induced Slow Magnetic Relaxation in Mn_9W_6 Cluster-Based Compound

“…Polynuclear clusters are studied widely by both chemists and physicists for their magnetic, optical and electronic properties [1][2][3][4]. High-nuclearity clusters based on magnetically coupled paramagnetic ions can often reveal a high-spin ground state.…”