On October 15, 2007, Wang, Jian; Djukic, Brandon; Cao, Jingyi; Alberola, Antonio; Razavi, Fereidoon S.; Pilkington, Melanie published an article.HPLC of Formula: 75449-26-2 The title of the article was A novel bis tridentate bipyridine carboxamide ligand and its complexation to copper(II): synthesis, structure, and magnetism. And the article contained the following:
A new bis tridentate ligand 2,2′-bipyridine-3,3′-[2-pyridinecarboxamide] H2L1 which can bind transition metal ions was synthesized via the condensation of 3,3′-diamino-2,2′-bipyridine together with 2-pyridine carbonyl chloride. Two Cu(II) coordination compounds were prepared and characterized: [Cu2(L1)(hfac)2].3MeCN.H2O (1) and [Cu2(L1)Cl2].MeCN (2). The single-crystal x-ray structures reveal that complex 1 crystallizes in the triclinic space group P1̅, with a 12.7185(6), b 17.3792(9), c 19.4696(8) Å, α 110.827(2), β 99.890(3), γ 97.966(3)°, Z = 4, R = 0.0321 and Rw = 0.0826. Complex 2 crystallizes in the monoclinic space group P21/n with a 12.8622(12), b 9.6100(10), c 19.897(2) Å, β 102.027(3)°, Z = 4, R = 0.0409 and Rw = 0.1005. In both complexes the ligand is in the dianionic form and coordinates the divalent CuII ions via one amido and two pyridine N donor atoms. In 1, the coordination geometry around both CuII ions is best described as distorted trigonal bipyramidal where the remaining two coordination sites are satisfied by hexafluoroacetylacetonate counterions. In 2 both CuII ions adopt a (4 + 1) distorted square pyramidal geometry. One Cu forms a longer apical bond to an adjacent carbonyl O atom, whereas the second Cu is chelated to a neighboring Cu-Cl chloride ion to afford a μ-Cl-bridged dimerized [Cu2(L1)Cl2]2 complex. The magnetic susceptibility data for 1 (2 -270 K), reveal the occurrence of weak antiferromagnetic interactions between the CuII ions. In contrast, variable-temperature magnetic susceptibility measurements for 2 reveal more complex magnetic properties, with the presence of a weak antiferromagnetic exchange (J = -10.1 K) between the Cu ions in each dinuclear Cu complex and a stronger ferromagnetic exchange interaction (J = 32.9 K) between the CuII ions of the Cu(μ-Cl)2Cu dimeric bridging units. The experimental process involved the reaction of [2,2′-Bipyridine]-3,3′-diamine(cas: 75449-26-2).HPLC of Formula: 75449-26-2
The Article related to copper bipyridinepyridinecarboxamide preparation structure magnetic exchange, crystal structure copper bipyridinepyridinecarboxamide fluoroacac chloro dinuclear, exchange ferromagnetic antiferromagnetic copper bipyridinepyridinecarboxamide and other aspects.HPLC of Formula: 75449-26-2