New dinuclear copper(II) complexes with azomethines and hydrazones, which were pro duced by condensation of substituted salicylaldehyde derivatives with 1,3 diaminopropan 2 ol or carbo(thiocarbo)hydrazide, were studied. The structures of the [Cu 2 L(µ CH 2 ClCOO)(CH 3 OH)]•(CH 3 OH) (L = C 17 H 15 N 2 O 3 ) and [Cu 2 L 2 (Cl 3 CCO)(CH 3 OH)]•H 2 O (L 2 = C 32 H 42 N 4 O 3 ) complexes were established by X ray diffraction. The magnetic properties of these complexes, including the influence of the nature of the substituents in the ligands on exchange interactions, were studied.Dinuclear copper(II) compounds with azomethine ligands and their analogs with other 3d atoms have at tracted particular attention because of their structural characteristics and magnetic properties. 1-19 The Cu II atoms contain one unpaired electron, which substan tially simplifies calculations of the energy parameters of exchange interactions. In addition, complexes with the azomethine ligand contain the stable dinuclear Cu(µ X)(µ X 1 )Cu fragment, whose geometric parameters depend only slightly on the nature of the substituents at the periphery of the molecule. This fact allows one to rather correctly estimate the exchange parameters for se ries of complexes and predict the existence of new com pounds possessing the desired magnetic properties. In this respect, compounds containing various types of X and X 1 bridges (for example, containing one and three atom bridges) are of most interest. Among these compounds are copper complexes, in which the carboxylate group serves as one of the bridging ligands (structures A and B).Investigations of such complexes containing various substituents in chelate bridging ligands and the carboxy late group provide estimates of the influence of the elec tronic and steric factors on the energetics of the spin spin exchange. However, it is important to know not only the magnetic properties but also the detailed geometry of the complexes, which requires the use of X ray diffraction. In the present study, we analyzed the magnetic data for a series of compounds of types A and B and established the structures of the key complexes.
Results and DiscussionRecently, 20,21 we have developed convenient proce dures for the synthesis of a series of complexes A and B. The structure of the A type copper complex (R 1 = R 2 = H, R 3 = Me) has been established by X ray diffraction analy sis. 21 Magnetic measurements and calculations of the ex change parameters (Table 1) revealed a wide range of the -2J values for the systems under study. For complexes A,
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