Premium
Trinuclear Early/Late‐Transition‐Metal Thiolate Complexes
Author(s) -
Eichhöfer Andreas,
Andrushko Vasyl,
Bodenstein Tilmann,
Fink Karin
Publication year - 2014
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.201402069
Subject(s) - chemistry , intramolecular force , antiferromagnetism , density functional theory , crystallography , vanadium , transition metal , nickel , metal , ab initio , ab initio quantum chemistry methods , absorption (acoustics) , inorganic chemistry , computational chemistry , stereochemistry , molecule , catalysis , physics , organic chemistry , acoustics , condensed matter physics , biochemistry
The thiolato‐bridged cobalt(II)/vanadium(II) complexes [Li(thf) 4 ] 2 [Co 2 V(SPh) 8 ] and [Li(15‐crown‐5)(thf)] 2 [Co 2 V(SPh) 8 ] as well as a related nickel(II)/vanadium(II) complex [Li(15‐crown‐5)(thf)] 2 [Ni 2 V(SPh) 8 ] have been prepared by treatment of CoCl 2 (NiCl 2 ) and VCl 3 {[VCl 3 (thf) 3 ]} with LiSPh in THF without and in the presence of 15‐crown‐5, respectively. The crystal structures of the trinuclear compounds were determined by X‐ray analysis of single crystals and investigated by density functional theory. Both give evidence for one very short Ni–V distance (259.41 pm) in [Li(15‐crown‐5)(thf)] 2 [Ni 2 V(SPh) 8 ]. The dark‐coloured compounds display absorption bands over a wide energy range with an absorption onset lying in the near‐infrared region at approximately 2000 nm. Magnetic measurements show strong antiferromagnetic coupling of the metal ions through acute phenylthiolate bridges (M–S–M < 76.1°). Ab initio multireference calculations together with mapping approaches reveal that the magnetic properties of the anionic metal complexes can be described by different effective spin Hamiltonians that indicate different types of intramolecular interactions between the metal ions. In [Co 2 V(SPh) 8 ] 2– , we found at low temperatures an effective S = 3/2 behaviour with small zero‐field splitting (ZFS) caused by a strong, symmetric antiferromagnetic exchange interaction. A weak direct Ni–V bond in [Ni 2 V(SPh) 8 ] 2– generates an effective two‐centre system that consists of an effective spin of S = 1/2 from the weakly bound Ni–V pair and a pseudospin S = 1 located on the other nickel site, antiferromagnetically coupled to an S = 1/2 ground state.