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Reinecke Anion Derivatives and Homobinuclear Complexes as Tectons in Designing Heteropolymetallic Systems
Author(s) -
Cucos Andrei,
Avarvari Narcis,
Andruh Marius,
Journaux Yves,
Müller Achim,
Schmidtmann Marc
Publication year - 2006
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200500841
Subject(s) - chemistry , nickel , ligand (biochemistry) , crystallography , antiferromagnetism , cationic polymerization , chromium , ion , crystal structure , metal , metal ions in aqueous solution , stereochemistry , inorganic chemistry , polymer chemistry , organic chemistry , biochemistry , physics , receptor , condensed matter physics
Two novel Cr III –Ni II heteropolynuclear complexes have been obtained through a self‐assembly process involving abinuclear Ni II complex with a macrocyclic Robson ligand and Reinecke‐type anions ( trans ‐[Cr(NCS) 4 (NH 3 ) 2 ] – , trans ‐[Cr(NCS) 4 (4,4′‐bipy) 2 ] – ): [Ni 2 (H 2 O) 2 (fsal‐33){Cr(NCS) 4 (NH 3 ) 2 }] · 2H 2 O ( 1 ) and 1 ∞ [Ni 2 (H 2 O) 2 (fsal‐33){Cr(NCS) 4 (4,4′‐bipy) 2 }] n · n [Cr(NCS) 4 (4,4′‐bipy) 2 ] ( 2 ). The compartmental ligand results from the condensation of 2,6‐diformyl‐4‐methyl‐phenol with 1,3‐propanediamine. The crystal structure of 1 consists of neutral tetranuclear [CrNiNiCr] species, where each nickel ion is coordinated in one apical position by a Reinecke anion, and in the other one by an aqua ligand. The distances between the metallic centres in 1 are: Ni ··· Cr = 6.048 and Ni ··· Ni = 3.133 Å. Compound 2 contains infinite cationic chains constructed from binuclear [Ni–Ni] nodes, connected through trans ‐[Cr(4,4′‐bipy) 2 (NCS) 4 ] spacers, and uncoordinated trans ‐[Cr(NCS) 4 (4,4′‐bipy) 2 ] – ions. The Cr III and Ni II ions are connected through 4,4′‐bipyridine ligands arising from the Reinecke‐type anion. The distance between the nickel and chromium ions within the chain is 11.252 Å. The magnetic properties of 1 have been investigated. Both Ni–Ni and Cr–Ni exchange interactions were found to be antiferromagnetic: J NiNi = –51.3 cm –1 ; J NiCr = –22.7 cm –1 . (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)