Nickel(II)-PPh ₃ complexes of substituted benzophenone thiosemicarbazones: Electrochemistry, structural analysis, and antioxidant properties

Synthesis and antioxidant activities of new nickel(II) complexes derived from 4-benzy- loxysalicylidene-S-methyl/propyl thiosemicarbazones

“…When 1 H-NMR spectra of thiosemicarbazones are examined, the proton of the phenolic hydroxyl group appeared as singlet at 11.53,11.31 ppm (for 1) and 11.76, 11.56 ppm (for 2) in different isomer ratios. The absence of these peaks in their complex spectra supports that the coordination is through phenolic oxygen [38]. In addition, the isomerism of the CH=N 1 group, which was recorded as singlet in the range of 8.33-8.18 ppm in the spectra of thiosemicarbazones, was not observed in the spectra of the complexes due to hindered rotation around C=N 1 and C=N 4 double bond on complexation [39].…”

The rigidity and chelation effect of ligands on the hydrogen evolution reaction catalyzed by Ni(ii) complexes

“…The synthesis of stable Ni( ii ) phosphine-based complexes is still challenging and only a few complexes are reported. 6,46–50 Singh et al have synthesized functionalized heteroleptic Ni( ii ) dithiolate-phosphine-based complexes and studied their ability to catalyse water oxidation (oxygen evolution reaction) 47 as well as investigated their photosensitizing properties 51 and semiconductor behaviour. 52…”

“…The synthesis of stable Ni(II) phosphine-based complexes is still challenging and only a few complexes are reported. 6,[46][47][48][49][50] Singh et al have synthesized functionalized heteroleptic Ni(II) dithiolate-phosphine-based complexes and studied their ability to catalyse water oxidation (oxygen evolution reaction) 47 as well as investigated their photosensitizing properties 51 and semiconductor behaviour. 52 In this study, we have synthesized and characterized three heteroleptic Ni(II) complexes with the general formula [Ni(II)L (L′) 2 ], where L = 2-(methylene-1,1′-dithiolato)-5,5′-dimethylcyclohexane-1,3-dione is a common component in all complexes, while L′ varies as PPh 3 (1), DPPF (2), and DPPE (3).…”