Polymeric complexes of copper(II) azide and 2,5-dimethylpyridine without and with solvent molecules. Synthesis, spectral and structural characterization of [Cu(2,5-dimethylpyridine) (N3)2]n and [Cu(2,5-dimethylpyridine) (N3)2(H2N-CHO)]2
作者： Mohamed A.S. Goher , Franz A. Mautner , Najeeb A. Al-Salem
DOI: 10.1016/S0277-5387(96)00537-2
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摘要: Abstract Catina di-μ(1,1)-azido[di-μ(1,1)-azidobis(2,5-dimethylpyridine)dicopper(II)] (1) and di-μ(1,1)-azidobis[azido(2,5-dimethylpyridine)(formamide)]dicopper(II) (2) were synthesized characterized by spectroscopic crystallographic methods. In the triclinic complex 1 copper(II) centres are penta-coordinated four nitrogen atoms from azido ligands [CuN distances = 1.980(3)-2.249(4) A] a fifth organic molecule at CuN bond length of 2.038(4) A. Both function as μ(1,1) bridges to form chains polyhedra along axis. The dimeric 2, which possesses inversion centre, contains both terminal bridging ligands. Each atom is further coordinated 2,5-dimethylpyridine [ Cu O 1.998(4) A ] formamide via its carbonyl oxygen 2.356(4) give distorted square pyramid. IR absorption spectra reveal asymmetric in complexes, O-bonded hydrogen bonds well, 2. solid solution electronic complexes exhibit more than one strong N3− → CuII charge-transfer transition band. room-temperature EPR powdered samples DMF solutions recorded discussed.
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