862076-33-3Relevant academic research and scientific papers
Magneto-structural relationships in a series of dinuclear oxalato-bridged (diphenyldipyrazolylmethane)copper(II) complexes
Shaw, Janet L.,Yee, Gordon T.,Wang, Guangbin,Benson, David E.,Gokdemir, Cagil,Ziegler, Christopher J.
, p. 5060 - 5067 (2005)
A series of oxalato-bridged dinuclear copper(II) complexes of the general formula [Cu2(Pz2CPh2)2(X) 2(μ-C2O4)] (X = Cl- (1), NO 3- (2), ClO4- (3); Pz 2CPh2 = diphenyldipyrazolylmethane) or [Cu 2(Pz3m2CPh2)2(H 2O)2(μ-C2O4)]-(NO 3)2·H2O (4) (Pz3m 2CPh2 = diphenylbis(3-methylpyrazolyl)methane) was synthesized where the axial ligand was systematically varied to study its effect on structure and magnetic coupling. The structures of compounds 1, 2, and 4 have been elucidated by single-crystal X-ray diffraction. [Cu 2(Pz2CPh2)2(Cl)2(μ- C2O4)] and [Cu2(Pz2CPh 2)2(NO3)2-(μ-C2O 4)] are isostructural and crystallize in the triclinic system, space group P1, Z= 2, with a = 8.6155(8) A, b = 10.1435(9) A, c = 11.3612(11) A, α = 95.535(2)°, β = 110.303(2)°, and γ = 106.111(2)° for 1 and with a = 8.863(7) A, b = 10.241(9) A, c = 11.425(10) A, α = 98.985(14)°, β = 110.449(13)°, and γ = 103.664(14)° for 2. [Cu2(Pz 3m2CPh2)2(H2O) 2(μ-C2O4)]·NO3· H2O crystallizes in the monoclinic system, space group C2/c, Z = 4, with a = 23.4588(14) A, b = 8.8568(5) A, c = 21.7818(13) A, α = γ = 90°, and β = 100.8890(10)°. Variable-temperature magnetic susceptibility studies indicate that all four compounds are strongly antiferromagnetically coupled (2J/k = -364, -344 cm -1 (2), -424 cm-1 (3), and -378 cm-1 (4)). Magnetic and EPR results are discussed with respect to structural parameters to explore possible magneto-structural correlations.
