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Issue 48, 2014
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Crystal structures and magnetic properties of chiral heterobimetallic chains based on the dicyanoruthenate building block

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Abstract

By the reaction of chiral MnIII Schiff-base complexes with the dicyanoruthenate building block, [Ru(salen)(CN)2] (salen2− = N,N′-ethylenebis(salicylideneimine) dianion), two couples of enantiomerically pure chiral cyano-bridged heterobimetallic one-dimensional (1D) chain complexes, [Mn((R,R)-salcy)Ru(salen)(CN)2]n (1-(RR)) and [Mn((S,S)-salcy)Ru(salen)(CN)2]n (1-(SS)) (Salcy = N,N′-(1,2-cyclohexanediylethylene)bis(salicylideneiminato) dianion), [Mn((R,R)-salphen)Ru(salen)(CN)2]n (2-(RR)) and [Mn((S,S)-salphen)Ru(salen)(CN)2]n (2-(SS)) (salphen = N,N′-(1,2-diphenylethylene)bis(salicylideneiminato) dianion), were synthesized and structurally characterized. Circular dichroism (CD) and vibrational circular dichroism (VCD) spectra confirm the enantiomeric nature of the optically active complexes. Structural analyses reveal the formation of neutral cyano-bridged zigzag single chains in 1-(RR) and 1-(SS), and double chains in 2-(RR) and 2-(SS). Magnetic studies show that antiferromagnetic coupling is operative between RuIII and MnIII centers bridged by cyanide. Compounds 1-(RR) and 1-(SS) show metamagnetic behavior with a critical field of about 7.2 kOe at 1.9 K resulting from the intermolecular π⋯π interactions. Additionally, magnetostructural correlation for some typical cyano-bridged heterobimetallic RuIII–MnIII compounds is discussed.

Graphical abstract: Crystal structures and magnetic properties of chiral heterobimetallic chains based on the dicyanoruthenate building block

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Publication details

The article was received on 19 Aug 2014, accepted on 03 Oct 2014 and first published on 03 Oct 2014


Article type: Paper
DOI: 10.1039/C4DT02518K
Author version available: Download Author version (PDF)
Citation: Dalton Trans., 2014,43, 18047-18055
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    Crystal structures and magnetic properties of chiral heterobimetallic chains based on the dicyanoruthenate building block

    J. Ru, F. Gao, M. Yao, T. Wu and J. Zuo, Dalton Trans., 2014, 43, 18047
    DOI: 10.1039/C4DT02518K

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