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Issue 22, 2018
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Pre-programmed self-assembly of polynuclear clusters

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This perspective reviews our recent efforts towards the self-assembly of polynuclear clusters with ditopic and tritopic multidentate ligands HL1 (2-phenyl-4,5-bis{6-(3,5-dimethylpyrazol-1-yl)pyrid-2-yl}-1H-imidazole) and H2L2 (2,6-bis-[5-(2-pyridinyl)-1H-pyrazole-3-yl]pyridine), both of which are planar and rigid molecules. HL1 was found to be an excellent support for tetranuclear [Fe4] complexes, [FeII4(L1)4](BF4)4 ([FeII4]) and [FeIII2FeII2(L1)4](BF4)6 ([FeIII2FeII2]). The homovalent system was found to exhibit multistep spin crossover (SCO), while the mixed-valence [FeIII2FeII2] complex shows wavelength-dependent tuneable light-induced excited spin state trapping (LIESST). For H2L2, a variety of polynuclear complexes were obtained through complexation with different transition metal ions, allowing the isolation of rings, grids, and helix structures. The rigidity of the ligand, difference in its coordination sites, and affinity for different metal ions dictates its coordination behaviour. In this paper, we summarise these ligand pre-programmed self-assembled clusters and their diverse physical properties.

Graphical abstract: Pre-programmed self-assembly of polynuclear clusters

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Article information

03 Mar 2018
10 Apr 2018
First published
18 Apr 2018

Dalton Trans., 2018,47, 7384-7394
Article type

Pre-programmed self-assembly of polynuclear clusters

T. Shiga, G. N. Newton and H. Oshio, Dalton Trans., 2018, 47, 7384
DOI: 10.1039/C8DT00822A

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