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A Square‐Planar Dinickel(II) Complex with a Noninnocent Dinucleating Oxamate Ligand: Evidence for a Ligand Radical Species
Author(s) -
Aukauloo Ally,
Ottenwaelder Xavier,
Ruiz Rafael,
Poussereau Sandrine,
Pei Yu,
Journaux Yves,
Fleurat Paul,
Volatron Francois,
Cervera Beatriz,
Muñoz M. Carmen
Publication year - 1999
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/(sici)1099-0682(199907)1999:7<1067::aid-ejic1067>3.0.co;2-7
Subject(s) - chemistry , electron paramagnetic resonance , ligand (biochemistry) , crystallography , nickel , bimetallic strip , diamagnetism , crystal structure , molecule , benzene , radical ion , stereochemistry , ion , nuclear magnetic resonance , metal , organic chemistry , biochemistry , physics , receptor , quantum mechanics , magnetic field
The new bimetallic nickel(II) compound (PPh 4 ) 4 [Ni 2 ( 2 )] · 6H 2 O ( 3 ), where H 8 [ 2 ] stands for N , N′ , N′′ , N′′′ ‐1,2,4,5‐benzene‐tetrayltetrakis(oxamic acid), has been synthesized and its crystal structure determined by single‐crystal X‐ray diffraction. The structure of 3 consists of [Ni 2 (η 4 :η 4 ‐ 2 )] 4– anions, tetraphenylphosphonium cations, and water molecules. Facile one‐electron oxidation of the square‐planar diamagnetic dinickel(II) complex [Ni 2 (η 4 :η 4 ‐ 2 )] 4– generates the metallo‐radical species [Ni 2 (η 4 :η 4 ‐ 2 · + )] 3– with characteristic intra ‐ligand π‐cation radical transitions in the visible region (475–550 nm) as well as a typical quasi‐isotropic EPR signal at g ≈ 2.0.