Premium
Tetracarboxylatodirhenium Complexes Linked by Axial Cyano Bridges to Metalpentacarbonyl Ligands – Synthesis and Characterization
Author(s) -
Kühn Fritz E.,
Gonçalves Isabel S.,
Lopes André D.,
Lopes João P.,
Romão Carlos C.,
Wachter Wolfgang,
Mink Janos,
Hajba Làszló,
Parola A. Jorge,
Pina Fernando,
Sotomayor João
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(19990202)1999:2<295::aid-ejic295>3.0.co;2-#
Subject(s) - chemistry , characterization (materials science) , stereochemistry , combinatorial chemistry , nanotechnology , materials science
Reaction of Re 2 {μ‐O 2 CC(CH 3 ) 3 } 4 Cl 2 with [(CO) 5 M–CN]Na (M = Cr, Mo, W) leads to tetranuclear complexes of formula Re 2 {μ‐O 2 CC(CH 3 ) 3 } 4 [–NC–M(CO) 5 ] 2 (M = Cr, Mo, W). These complexes were characterized by 1 H‐, 13 C‐, and 95 Mo‐NMR, IR and Raman spectroscopy, elemental analysis and examined by cyclic voltammetry. The applied methods show the donor capabilities of the [(CO) 5 M–CN] − ligands which shift electron density towards the Re centers weakening the Re–Re quadruple bond. The Re–Re bond lengths and the ν(Re–Re) force constants are estimated based on the FT‐IR and Raman examinations. Photochemical examinations and TG/MS experiments have also been conducted. The latter method shows that the product complexes decompose around 100 °C, by first loosing their carbonyl substituents; as do the Cr, Mo, W precursor compounds. The dirhenium tetrapivalate unit decomposes only at higher temperatures in a distinct second step.