NDLI: Ruthenium(II)-arylazoimidazole-8-hydroxyquinolinate complexes: Synthesis, spectral study (H, C, COSY, HMQC-NMR) and redox properties

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Ruthenium(II)-arylazoimidazole-8-hydroxyquinolinate complexes: Synthesis, spectral study (H, C, COSY, HMQC-NMR) and redox properties

Content Provider	Springer Nature Link
Author	Byabartta, P.
Copyright Year	2009
Abstract	The reaction of [Ru(OH$_{2}$)$_{2}$(RaaiR′)$_{2}$]$^{2+}$ (RaaiR′ = 1-alkyl-2-(arylazo)imidazole, p-R-C$_{6}$H$_{4}$-N=N-C$_{3}$H$_{2}$NN(1)-R′, R = H (1), Me (2), Cl (3); R′ = Me (a), Et (b), CH$_{2}$Ph (c)) with 8-quinolinol (HQ) in acetone solution followed by the addition of NH$_{4}$PF$_{6}$ has afforded violet coloured mixed ligand complexes of the composition [Ru(Q)(RaaiR′)$_{2}$](PF$_{6}$). The maximum molecular peak of 1b is observed at m’z 790 (50%) in the ESI mass spectrum. Ir spectra of the complexes show -C=N- and -N=N- stretching near at 1590 and 1370 cm$^{−1}$. The $^{1}$H NMR spectral measurements suggest methylene, -CH$_{2}$−, in RaaiEt gives a complex AB type while in RaaiCH$_{2}$Ph it shows AB type quartets. Considering the arylazoimidazole and oxine moitie there are twenty different carbon atoms in the molecule which gives a total of twenty different peaks in the C$^{13}$ NMR spectrum of complex 1a. In the $^{1}$H-$^{1}$H COSY spectrum of the present complexes, absence of any off-diagonal peaks extending from δ = 14.12 and 9.55 ppm confirm their assignment of no proton on N(1) and N(3) respectively. Contour peaks in the $^{1}$H-$^{13}$C HMQC spectrum in the present complexes, the absence of any contours at δ = 157.12, 160.76, 155.67 ppm and 157.68–160.2 ppm assign them to the C(2), C(6), C(g) and C(h), C(i) carbon atoms respectively. The solution structure and stereoretentive transformation in each step have been established from n.m.r. results. Cyclic voltammograme show a Ru(III)/Ru(II) couple at 1.0–1.1 V versus SCE along with three successive ligand reductions.
Starting Page	1401
Ending Page	1406
Page Count	6
File Format	PDF
ISSN	00360236
Journal	Russian Journal of Inorganic Chemistry
Volume Number	54
Issue Number	9
e-ISSN	15318613
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2009-09-15
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Inorganic Chemistry
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Materials Science Inorganic Chemistry

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