Spectroscopic and thermodynamic studies on solvatochromic nickel(II) complexes |
| |
Authors: | Ali Taha Viktor Gutmann Wolfgang Linert |
| |
Institution: | (1) Institute of Inorganic Chemistry, Technical University of Vienna, A-1060 Wien, Austria |
| |
Abstract: | Summary The solvatochromic and thermochromic behaviour of a series of mixed Ni(II) complexes with unsubstituted and substituted -diketones and diamines in the solvents 1,2-dichloroethane (DCE), acetonitrile (An), acetone (AC),n-butanol (n-BuOH), formamide (FA), N,N-dimethylformamide (DMF), dimethylsulfoxide (DMSO) and pyridine (PY) has been studied and characterized on the basis of electronic spectra. Spectrophotometric methods have been used to evaluate equilibrium constants and their enthalpic and entropic terms for the formation of Ni(-dik)(diam)L
+ and Ni(-dik)(diam)L
2
+
. Increasing donor strength of the donor-solvents (L) and (or) increasing electronwithdrawing parameters of the substituents at the -diketone and the diamine ligands lead to increasing formation constants, paralleled by relative increase in the stability of the five-coordinated species Ni(-dik)(diam)L
+. The results are discussed in terms of the extended donor-acceptor concept.On leave of absence from the Faculty of Education, Ain Schams University, Roxy, Cairo, Egypt |
| |
Keywords: | Nickel(II) complexes Solvatochromism Thermochromism -Diketones" target="_blank">gif" alt="beta" align="MIDDLE" BORDER="0">-Diketones Diamines |
本文献已被 SpringerLink 等数据库收录! |
|