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Issue 20, 2020
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Structure and magnetic properties of a novel heteroheptanuclear metal string complex [Ni3Ru2Ni27-teptra)4(NCS)2](PF6)

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Abstract

We report the synthesis of a novel heteroheptanuclear metal string complex (HMSC) [Ni3Ru2Ni27-teptra)4(NCS)2](PF6) 1 supported by tetra-pyridyl-tri-amine (H3teptra) ligands. We employed X-ray diffraction and other spectroscopic techniques to characterize the complex. The observed remarkably short Ru–Ru distance of 2.2499(3) Å for 1 is indicative of a unique metal–metal interaction in the mixed-valence [Ru2]5+ (S = 3/2) unit. The complex exhibits a relatively high magnetic moment value of 4.55 B.M. at 4 K, which increases rapidly to 6.00 B.M. at 30 K and remains at 6.11 B.M. from 50 to 300 K as shown by SQUID measurements, indicating a high spin (S ≥ 3/2) system which is further supported by the analyses of EPR spectra at low temperatures. These magnetic behaviors can be ascribed to the result of spin-exchange interactions among multi-spin centers.

Graphical abstract: Structure and magnetic properties of a novel heteroheptanuclear metal string complex [Ni3Ru2Ni2(μ7-teptra)4(NCS)2](PF6)

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Supplementary files

Article information


Submitted
14 Jan 2020
Accepted
21 Apr 2020
First published
24 Apr 2020

Dalton Trans., 2020,49, 6635-6643
Article type
Paper

Structure and magnetic properties of a novel heteroheptanuclear metal string complex [Ni3Ru2Ni27-teptra)4(NCS)2](PF6)

C. Chiu, M. Cheng, S. Lin, C. Yan, G. Lee, M. Chang, T. Lin and S. Peng, Dalton Trans., 2020, 49, 6635
DOI: 10.1039/D0DT00156B

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