A Square-Planar Dinickel(II) Complex with a Noninnocent Dinucleating Oxamate Ligand: Evidence for a Ligand Radical Species

✍ Scribed by Ally Aukauloo; Xavier Ottenwaelder; Rafael Ruiz; Sandrine Poussereau; Yu Pei; Yves Journaux; Paul Fleurat; Francois Volatron; Beatriz Cervera; M. Carmen Muñoz

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 261 KB
• Volume: 1999
• Category: Article
• ISSN: 1434-1948
• DOI: 10.1002/(sici)1099-0682(199907)1999:7<1067::aid-ejic1067>3.0.co;2-7

✦ Synopsis

The new bimetallic nickel(II) compound (PPh 4 ) 4 [Ni 2 (2)]•6H 2 O cules. Facile one-electron oxidation of the square-planar diamagnetic dinickel(II) complex [Ni 2 (η 4 :η 4 -2)] 4-generates (3), where H 8 [2] stands for N,NЈ,NЈЈ,NЈЈЈ-1,2,4,5-benzenetetrayltetrakis(oxamic acid), has been synthesized and its the metallo-radical species [Ni 2 (η 4 :η 4 -2 •+ )] 3-with characteristic intra-ligand π-cation radical transitions in the visible crystal structure determined by single-crystal X-ray diffraction. The structure of 3 consists of [Ni 2 (η 4 :η 4 -2)] 4- region (475-550 nm) as well as a typical quasi-isotropic EPR signal at g ഠ 2.0. anions, tetraphenylphosphonium cations, and water mole-[a] Laboratoire de Chimie Inorganique, UMR CNRS 8613, Unitural characterisation together with the electrochemical versite ´de Paris-Sud, properties of the tetraphenylphosphonium salt of the di-F-91405 Orsay, France nickel(II) complex of formula (PPh 4 ) 4 [Ni 2 (2)] • 6 H 2 O (3),