Spectrophotometric investigation of the interaction of nickel 8-hydroxyquinolinate and 8-mercaptoquinolinate with donor-active monodentate reagents

Kazanova, N. N.; Antipova-Karataeva, I. I.; Petrukhin, O. M.; Zolotov, Yu. A.

doi:10.1007/bf00922301

Cited by 2 publications

(3 citation statements)

References 9 publications

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“…The high absorption of these bands allows to assign them to the metal to ligand charge transfer. 22,37,38 According to the analysis of the spectra of a series of square flat nickel complexes, 39 the 4p zorbital of a metal ion and four p-orbitals of coordinating ligand atoms form a binding molecular p-orbital which participates in many transitions. In coordination of the nitrogen-containing extra ligand along the axial axis, the 4p z -orbital of the nickel ion stops interacting with the p-orbitals of equatorial ligands and the bands of charge transfer disappear.…”

Section: Nature Of Intermediates In Photochromic (Sbf) 2 and Ni(sr) 2...mentioning

confidence: 99%

Photochromic processes in di(mercaptoquinolinato)Ni(II) complex and perfluordiphenyl disulfide solutions

Vorobyev

Kolomeets

Ivanov

et al. 2011

Photochem Photobiol Sci

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Laser flash photolysis was used to study the nature and reactions of intermediates for a novel photochromic system consisting of perfluorodiphenyl disulfide (F(5)C(6)SSC(6)F(5) = (SBF)(2)) and a flat di(mercaptoquinolinato)Ni(II) (Ni(SC(6)H(3)NC(3)H(3))(2) = Ni(SR)(2)) complex in benzene solutions. Under UV-radiation disulfide dissociates into two sulfur-containing radicals (F(5)C(6)S˙ = ˙SBF) that vanish in recombination. In the presence of the Ni(SR)(2) complex recombination competes with radical coordination yielding the radical (SBF˙)Ni(SR)(2) complex. This complex has an absorption band in the visible region and disappears in the second-order reaction when radical-complex recombines into dimer ((RS)(2)Ni(SBF)(2)Ni(SR)(2)). Subsequent dimer dissociation into initial disulfide and two Ni(SR)(2) complexes completes the photochromic cycle.

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Section: Nature Of Intermediates In Photochromic (Sbf) 2 and Ni(sr) 2...mentioning

confidence: 99%

Photochromic processes in di(mercaptoquinolinato)Ni(II) complex and perfluordiphenyl disulfide solutions

Vorobyev

Kolomeets

Ivanov

et al. 2011

Photochem Photobiol Sci

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“…The greater intensity of these bands makes it possible to at tribute them to metal-ligand charge transfer bands. 16,17 According to analysis of the spectra of several square pla nar nickel complexes, 34 the 4p z orbital of the metal ion and four π orbitals of the coordinating atoms of the ligands, form a bonding molecular π orbital involved in many transitions. For coordination of the nitrogen containing extraligand along the axial axis, the 4p z orbital of the nickel ion stops interacting with the π orbitals of the equatorial ligands, and the charge transfer bands disappear.…”

Section: Rs • + Rs • Rssrmentioning

confidence: 99%

“…The choice of the complex is caused by the capability of reversible adding extraligands of the type of pyridine and amines and by the presence of an intense absorption band in the visible spectral re gion. 16,17 This band allows one to monitor transforma tions of the complex upon laser pulse photolysis.…”

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confidence: 99%

Photochromic transformations in solutions of 8,8′-diquinolyl disulfide and di(mercaptoquinolinato)nickel(II)

et al. 2005

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The nature of intermediate species and their reactions were studied by laser pulse photolysis for a photochromic system consisting of 8,8´ diquinolyl disulfide (RSSR) and a planar Ni II complex di(mercaptoquinolinato)nickel(II) (Ni(SR) 2 ) in toluene and benzene solutions. Un der exposure to laser radiation, disulfide RSSR dissociates to two RS • radicals, whose spectrum has an intense absorption band with a maximum at λ = 400 nm (ε = 8400 L mol -1 cm -1 ). The radicals disappear by recombination (2k rec = 4.6•10 9 L mol -1 s -1 ). In the presence of the Ni(SR) 2 complex, coordination of the radical (k coord = 4.4•10 9 L mol -1 s -1 ) competes with recombination to form a radical complex RS • Ni(SR) 2 having an intense absorption band with a maximum at 460 nm (ε = 16 600 L mol -1 cm -1 ). This species decays in the second order reaction (2k = 4.6•10 4 L mol -1 s -1 ). Since the photochromic system returns to the initial state, the reaction of two radical complexes is assumed to produce radical recombination and reduc tion of the disulfide and Ni(SR) 2 complex. Analysis of the kinetic data showed that some RS • radicals decay in the microsecond time interval due to the reaction with the RS • Ni(SR) 2 radical complex (k = 3.1•10 9 L mol -1 s -1 ).

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Spectrophotometric investigation of the interaction of nickel 8-hydroxyquinolinate and 8-mercaptoquinolinate with donor-active monodentate reagents

Cited by 2 publications

References 9 publications

Photochromic processes in di(mercaptoquinolinato)Ni(II) complex and perfluordiphenyl disulfide solutions

Photochromic processes in di(mercaptoquinolinato)Ni(II) complex and perfluordiphenyl disulfide solutions

Photochromic transformations in solutions of 8,8′-diquinolyl disulfide and di(mercaptoquinolinato)nickel(II)

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