caa a22 4500 469038829 CHVBK 20180323132804.0 cr unu---uuuuu 170328e19920401xx s 000 0 eng 10.1007/BF00810941 doi (NATIONALLICENCE)springer-10.1007/BF00810941 Photooxidation of bis(ethylxanthato)nickel(II) containing aromatic nitrogen heterocyclic ligands in chloroform [Elektronische Daten] [AHmed Osman, Aref Aly] Photooxidation von Bis(ethylxanthato)nickel(II) mit aromatischen Stickstoffheterocyclen enthaltenden Liganden in Chloroform The photochemistry of the complexes [Ni(Etxn)2(N-N)] [Etxn=ethylxanthate,N-N=2,2′-bipyridine(bpy), 4,4′-dimethyl-2,2′-bipyridine (4,4′-Me-bpy), 1,10-phenanthroline (phen) or 2,2′-bipyrimidine (bpym)] has been investigated. These complexes were not light sensitive in most solvents such as acetonitrile. Upon irradiation of chloroform solutions of these complexes, a photoredox reaction occurred giving the parent Ni(Etxan)2. It is suggested that the reactive excited state is of the charge-transfer-to-solvent (CTTS) type. The energy of this state depends on the redox potentials of the solvent. When CHCl3 as solvent was replaced by the stronger oxidant CCl4, the photoactive wavelength region was shifted to the red. It was blue shifted when the weaker oxidant CH2Cl2 was used. From quantum yield measurements it is concluded that the photostability of the studied complexes decreases in the following order:bpym>phen>bpy>4,4′-Me-bpy. Springer-Verlag, 1992 Photooxidation nationallicence Bis(ethylxanthato)nickel(II) mixed ligand complexes nationallicence Charge transfer to solvent (CTTS) nationallicence Osman AHmed Chemistry Department, Faculty of Science, Assiut University, Assiut, Egypt aut Aly Aref Chemistry Department, Faculty of Science, Assiut University, Assiut, Egypt aut Monatshefte für Chemie / Chemical Monthly Springer-Verlag 123/4(1992-04-01), 309-314 0026-9247 123:4<309 1992 123 706 https://doi.org/10.1007/BF00810941 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00810941 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Osman AHmed Chemistry Department, Faculty of Science, Assiut University, Assiut, Egypt aut NATIONALLICENCE 700 1- Aly Aref Chemistry Department, Faculty of Science, Assiut University, Assiut, Egypt aut NATIONALLICENCE 773 0- Monatshefte für Chemie / Chemical Monthly Springer-Verlag 123/4(1992-04-01), 309-314 0026-9247 123:4<309 1992 123 706 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer