Issue 19, 2018

Synthesis, structures and magnetic properties of heterobimetallic RuIII–3d (3d = Mn, Ni) compounds based on the chiral RuIII building block

Abstract

Two pairs of chiral cyano-bridged heterobimetallic compounds, [Mn(salen)Ru((R,R)-(5-Br-salcy))(CN)2]n (1), [Mn(salen)Ru((S,S)-(5-Br-salcy))(CN)2]n (2), [Ni(tren)][Ru((R,R)-(5-Cl-salcy))(CN)2]2 (3), and [Ni(tren)][Ru((S,S)-(5-Cl-salcy))(CN)2]2 (4) [salcy2− = N,N′-(1,2-cyclohexanediylethylene) bis(salicylideneiminato) dianion, tren = tri(2-aminoethyl)amine], have been synthesized and characterized by elemental analysis, IR spectroscopy, X-ray diffraction analyses, and circular dichroism (CD) and vibrational circular dichroism (VCD) spectra. Single X-ray diffraction analysis reveals that complexes 1 and 2 possess a chiral 1D zigzag chain structure that consists of alternating (R,R/S,S)-trans-[Ru(5-Br-salcy)(CN)2] and [MnIII(salen)]+ units. Complexes 3 and 4 are trinuclear complexes in which the central Ni(II) ion is coordinated with two terminal (R,R/S,S)-trans-[Ru(5-Cl-salcy)(CN)2] units through cyanide bridges. Investigation of magnetic susceptibilities indicates that antiferromagnetic coupling exists between the cyano-bridged RuIII and MnIII ions for complexes 1 and 2. An estimation of the barrier size (Ea) for 1 reveals a value of 19.1 K, with a characteristic time (τ0) of 1.95 × 10−8. Moreover, complexes 3 and 4 exhibit ferromagnetic coupling between RuIII and NiII through the cyanide bridges with J = 2.73 cm−1.

Graphical abstract: Synthesis, structures and magnetic properties of heterobimetallic RuIII–3d (3d = Mn, Ni) compounds based on the chiral RuIII building block

Supplementary files

Article information

Article type
Paper
Submitted
27 Jul 2018
Accepted
30 Aug 2018
First published
31 Aug 2018

New J. Chem., 2018,42, 16237-16243

Synthesis, structures and magnetic properties of heterobimetallic RuIII–3d (3d = Mn, Ni) compounds based on the chiral RuIII building block

J. Ru, R. Zhang, Y. Shi, S. Zhang, Q. Li and C. Ma, New J. Chem., 2018, 42, 16237 DOI: 10.1039/C8NJ03747G

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