Synproportionation reactions between copper(II) trihalogenoacetates Cu(CX3CO2)2, X = F, Cl or Br, and copper in the presence of carbon monoxide

Structural, Spectroscopic, Thermal, and Magnetic Properties of a New Dinuclear Copper Coordination Compound with Tiglic Acid

“…The magnitude of −2 J established for the studied compound matches almost perfectly the exchange integral found in copper acetate [Cu 2 (CH 3 COO) 4 (H 2 O) 2 ]: 286 cm −1 [ 14 ], which is a consequence of similar electronic properties of tiglate and acetate anions (pKa = 4.96 [ 43 ] and 4.76 [ 44 ], respectively). If analogous dicopper compound [Cu 2 (CCl 3 COO) 4 (CCl 3 COOH) 2 ] is composed of a stronger carboxylic acid (pKa for trichloroacetic acid is 0.66 [ 44 ]), −2 J value decreases to 240 cm −1 [ 45 ]. Given an experimental uncertainty of the absolute mass of the powder used to prepare the specimen (about 6%), n dimer was found to be very close to the expected value of unity.…”

Chlorobis(1,10-phenanthroline)(trichloroacetato)manganese(II)

“…Manganese complexes with carboxylate ligands have received extensive attention due to the fact that carboxylates are good candidates for the investigation of exchange-coupling interactions between adjacent metal ions (Soler et al, 2004). Trichloroacetic acid, a type of carboxylate organic ligand, and its coordination chemistry, have received a great deal of attention (Dell'Amico et al, 2000;Ng, 2004;Gomez-Segura et al, 2005;Dey et al, 2004). However, there are only a few reports on transition metal complexes with trichloroacetate and rigid chelating organic ligands such as 1,10-phenanthroline or 2,2bipyridine (de Boer et al, 2005;Yin et al, 2005).…”

Preparation and Crystal Structure of Copper(I) Carbonyl Hydrogensulfate, obtained by Carbonylation in Sulphuric AcidDedicated to Professor Joachim Strähle on the Occasion of his 65th Birthday

“…As the result of the reversible carbon monoxide absorption by Cu(ClO 4 ) 2 /Cu in water, compounds analytically characterised as Cu(ClO 4 )(CO)(H 2 O) x have been reported [6]. Work from these Laboratories has shown that trifluoro-and trichloroacetato carbonyl derivatives are obtained by syn-proportionation between copper(II) trihaloacetate and copper in the presence of CO [7]. Moreover, carbon monoxide was found to be absorbed by suspensions of Cu 2 O in Et 2 O in the presence of sulfonic acids (added molecular sieves take care of the water formed in the reaction), giving carbonyl derivatives of formula [Cu(SO 3 R)(CO)] n (with R ϭ CH 3 , C 2 H 5 , CF 3 or p-CH 3 C 6 H 4 ) [8].…”