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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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Supplementary files

Article information


Submitted
19 Aug 2014
Accepted
03 Oct 2014
First published
03 Oct 2014

Dalton Trans., 2014,43, 18047-18055
Article type
Paper
Author version available

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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