Reference

Synthesis, crystal structures, thermal analysis and magnetic property of mono- and binuclear 1,1-cyclobutanedicarboxylate copper complexes

All Rights Reserved. Synthesis, crystal structures, thermal analysis and magnetic property of mono- and binuclear 1,1-cyclobutanedicarboxylate copper complexes. Li, Ming-Xing; Dai, Hui; Shao, Min; Shi, Lei; Lin, Kun-Hua; Cheng, Zhi-Xuan; Weng, Lin-Hong (Department of Chemistry, College of Science, Shanghai University, Shanghai 200444, Peop. Rep. China). Chinese Journal of Chemistry, 24(4), 487-492 (English) 2006 Shanghai Institute of Organic Chemistry. CODEN: CJOCEV. ISSN: 1001-604X. DOCUMENT TYPE: Journal CA Section: 78 (Inorganic Chemicals and Reactions) Section cross-reference(s): 75 Two new Cu complexes, [Cu(cbdc)(phen)(H2O)]·2H2O (1) and [Cu2(cbdc)(phen)2(H2O)2](ClO4)2·H2O (2) (cbdc = 1,1-cyclobutanedicarboxylate and phen = 1,10-phenanthroline), were synthesized by reaction of cbdc with Cu(ClO4)2 and phen in EtOH aq. soln. Complex 1 crystallizes in monoclinic system with space group P21/c and a 0.9428(4), b 1.2183(5), c 1.6265(7) nm, b 102.418(5)°, Z = 4, R = 0.0445, wR2 = 0.0947. The structure of 1 is discretely mononuclear, which is packed by p×××p interaction forming a 3-dimensional supramol. structure where Cu(II) ion is five-coordinated and has square-pyramidal coordination geometry. Its thermal decompn. procedure detail was studied by thermal anal. TG-DSC. Complex 2 belongs to monoclinic system with space group P21/c and a 0.8897(3), b 1.9130(8), c 1.9936(8) nm, b 99.04(2)°, Z = 4, R = 0.0540, wR2 = 0.1102. The structure of 2 is a discrete dinuclear complex, where Cu(1) is four-coordinated by phen and cbdc in a square-planar geometry while Cu(2) is five-coordinated by phen, one O of cbdc and two H2O, which can be best described as distorted trigonal-bipyramidal geometry. Cu(1) and Cu(2) are linked by carboxylic group of cbdc in a bidentate bridging fashion. Variable-temp. 913186-47-7 and 5445-51-2 are just another two chemicals used in this study. magnetic susceptibilities of 2 in 2-300 K showed that its magnetic behavior obeyed Curie law. .

Relaxation kinetic investigation of the chelation of nickel(II) with cycloalkane-1,1-dicarboxylic acids

Relaxation kinetic investigation of the chelation of nickel(II) with cycloalkane-1,1-dicarboxylic acids.Some chemicals with cas registry numbers like 5802-65-3 and 5445-51-2 are also used. Calvaruso, Giuseppe; Cavasino, Francesco P.; Di Dio, Emanuele; Sbriziolo, Carmelo (Ist. Chim. Fis., Univ. Palermo, Palermo, Italy). Gazz. Chim. Ital., 106(9-10), 899-910 (English) 1976. CODEN: GCITA9. DOCUMENT TYPE: Journal CA Section: 67 (Catalysis and Reaction Kinetics) The kinetics and mechanism were studied of Ni(II) chelation with cyclopropane-, cyclobutane-, and cyclopentane-1,1-dicarboxylic acids at 25.degree. and ionic strength 0.10M by the temp.-jump relaxation method. There are 2 competitive paths involving Ni(II) ions and the dianion and monoanion of the dicarboxylic acids. For the monoanion of cyclopropane-1,1-dicarboxylic acid, the rate is detd. by deprotonation of the intermediate monodentate complex (H2O)5Ni(O-OH)+, but in all other cases the rate is detd. by the release of the 1st coordinated H2O mol. The chelate ring opening was also studied. .