1. Structure and magnetic properties of a novel heteroheptanuclear metal string complex [Ni3Ru2Ni2(μ7-teptra)4(NCS)2](PF6)
- Author
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Tien-Sung Lin, Cheng-Chang Chiu, Mu-Chieh Chang, Sheng-Hsiang Lin, Shie-Ming Peng, Cheng-Wei Yan, Gene-Hsiang Lee, and Ming-Chuan Cheng
- Subjects
Diffraction ,Materials science ,Magnetic moment ,Spectral line ,law.invention ,Inorganic Chemistry ,Metal ,SQUID ,Crystallography ,law ,visual_art ,visual_art.visual_art_medium ,C++ string handling ,Spin (physics) ,Electron paramagnetic resonance - 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) A 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.
- Published
- 2020