caa a22 4500 46577539X CHVBK 20180323111940.0 cr unu---uuuuu 170327e19901201xx s 000 0 eng 10.1007/BF01040773 doi (NATIONALLICENCE)springer-10.1007/BF01040773 Transition metal (disubstituted phenylazo)-barbituric and thiobarbituric acid complexes [Elektronische Daten] [Mamdouh Masoud, Mohamed El-Dessouky, Farag Aly, Saeyda Abou El-Enein] Summary: Disubstituted phenylazo-barbituric and thiobarbituric acid complexes derived from CoII, NiII and CuII salts have been prepared. Electronic spectra and magnetic susceptibility measurements prove that the cobalt and nickel complexes have high-spin octahedral and square planar configurations, respectively. The copper-barbituric complexes have distorted octahedral geometry with a possible Cu−Cu interaction, whereas the corresponding thiobarbiturate complexes have square pyramidal distorted octahedral and tetragonal geometries. The room temperature e.s.r. spectra of the copper complexes show anisotropy with axial symmetry in tetragonal geometry, $$d_{x^2 - y^2 } $$ ground state as a result of Cu−Cu interaction. This dimeric structure disappears in DMSO solution. The intradimer super-exchange interaction is temperature dependent indicating a change of the geometry. In some complexes, the azo group coordinates to the metal, in others it does not. The denticity of the ligands has been determined. Chapman and Hall Ltd, 1990 Masoud Mamdouh Chemistry Department, Faculty of Science, Alexandria University, Alexandria, Egypt aut El-Dessouky Mohamed Chemistry Department, Faculty of Science, Alexandria University, Alexandria, Egypt aut Aly Farag Chemistry Department, Faculty of Science, El-Menoufia University, Egypt aut Abou El-Enein Saeyda Chemistry Department, Faculty of Science, El-Menoufia University, Egypt aut Transition Metal Chemistry Kluwer Academic Publishers 15/6(1990-12-01), 443-448 0340-4285 15:6<443 1990 15 11243 https://doi.org/10.1007/BF01040773 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01040773 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Masoud Mamdouh Chemistry Department, Faculty of Science, Alexandria University, Alexandria, Egypt aut NATIONALLICENCE 700 1- El-Dessouky Mohamed Chemistry Department, Faculty of Science, Alexandria University, Alexandria, Egypt aut NATIONALLICENCE 700 1- Aly Farag Chemistry Department, Faculty of Science, El-Menoufia University, Egypt aut NATIONALLICENCE 700 1- Abou El-Enein Saeyda Chemistry Department, Faculty of Science, El-Menoufia University, Egypt aut NATIONALLICENCE 773 0- Transition Metal Chemistry Kluwer Academic Publishers 15/6(1990-12-01), 443-448 0340-4285 15:6<443 1990 15 11243 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer