Synthesis, Structure, Magnetism, and Single Molecular Conductance of Linear Trinickel String Complexes with Sulfur‐Containing Ligands

Autor:	Ching‐Chun Yang, Isiah Po-Chun Liu, Gene-Hsiang Lee, Shie-Ming Peng, Yu-Ju Hsu, Chun-hsien Chen
Rok vydání:	2012
Předmět:	Inorganic Chemistry Bond length Crystallography Molecular wire Stereochemistry Chemistry Magnetism Ligand Molecular conductance Antiferromagnetism Crystal structure Ion
Zdroj:	European Journal of Inorganic Chemistry. 2013:263-268
ISSN:	1099-0682 1434-1948
DOI:	10.1002/ejic.201200934
Popis:	The synthesis, crystal structures, magnetic properties, and single molecular conductances of two linear trinickel string complexes, [Ni3(mpta)4(NCS)2] (2) and [Ni3(mpta)4(CN)2] (3), supported by sulfur-containing Hmpta (1) ligands are presented (Hmpta = 4-methylpyridylthiazolylamine). Compounds 2 and 3 possess a 1D trinickel backbone coordinated by four mpta– ligands. Within the trinickel framework, the two terminal high-spin (S = 1) Ni ions are strongly antiferromagnetically coupled (J = –91 cm–1 in 2 and –79 cm–1 in 3). As the axial CN– ligand is very basic and strongly pulls the terminal Ni ions away from the central Ni ion, the Ni–Ni distances in 3 (ca. 2.52 A) are longer than those in 2 (ca. 2.47 A). The lengthening of the Ni–Ni bond lengths causes 3 to exhibit weaker antiferromagnetic interactions and lower single molecular conductance [R = 7.1 (±1.5) MΩ for 2 and R = 11.1 (±3.9) MΩ for 3].
Databáze:	OpenAIRE
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