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

Cheng-Chang Chiu; Ming-Chuan Cheng; Sheng-Hsiang Lin; Cheng-Wei Yan; Gene-Hsiang Lee; Mu-Chieh Chang; Tien-Sung Lin; Shie-Ming Peng

doi:10.1039/D0DT00156B

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

Cheng-Chang Chiu,

^a Ming-Chuan Cheng,

^b Sheng-Hsiang Lin,

^a Cheng-Wei Yan,^a Gene-Hsiang Lee,

^a Mu-Chieh Chang,

*^a Tien-Sung Lin

*^a and Shie-Ming Peng

*^ab

Author affiliations

* Corresponding authors

^a Department of Chemistry, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., 10617 Taipei, Taiwan, Republic of China
E-mail: smpeng@ntu.edu.tw, lin@wustl.edu, mcchang1005@ntu.edu.tw

^b Institute of Chemistry, Academia Sinica, 128 Academia Road, Section 2, Nankang, Taipei, Taiwan, Republic of China

Abstract

We report the synthesis of a novel heteroheptanuclear metal string complex (HMSC) [Ni₃Ru₂Ni₂(μ₇-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.

This article is part of the themed collection: Spotlight Collection: Lanthanide and transition metal complexes as molecular magnets

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Article information

DOI: https://doi.org/10.1039/D0DT00156B
Article type: Paper
Submitted: 14 Jan 2020
Accepted: 21 Apr 2020
First published: 24 Apr 2020

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Dalton Trans., 2020,49, 6635-6643

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Structure and magnetic properties of a novel heteroheptanuclear metal string complex [Ni₃Ru₂Ni₂(μ₇-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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