Synthesis and multinuclear NMR investigation on gold(III)-triphenylphosphine-pentafluorophenyl-arylazoimidazole |
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Authors: | P Byabartta |
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Institution: | (1) Departmento de Quimica Inorganica-ICMA, The Universidad de Zaragaza-CSIC, Zaragaza, 50009, Spain;(2) GIST, ICARE Complex Haldia Institute Technology, Hatiberia, Haldia, 721657, India |
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Abstract: | Reaction of Au(C6F5)(PPh3)(OSO2CF3)2] with RaaiR′ in dichloromethane medium followed ligand addition leads to Au(PPh3)(C6F5)(RaaiR′)](OSO2CF3)2 where RaaiR′ = p-R-C6H4-N=N-C3H2-NN-1-R′ (I–III), abbreviated as N, N′-chelator, where N(imidazole) and N(azo) represent N and N′, respectively; R = H (a),
Me (b), Cl (c) and R′ = Me (I), CH2CH3 (II), CH2Ph (III), PPh3 is triphenylphosphine, OSO2CF3 is the triflate anion. The maximum molecular peak of the corresponding molecule is observed in the ESI mass spectrum. IR
spectra of the complexes show -C=N- and -N=N- stretching near at ∼1590 and 1370 cm−1 and at ∼1100, 755, 695, 545, and 505 cm−1 due to the presence of triphenylphosphine and pentafluoropheny ring. The 1H NMR spectral measurements suggest methylene (-CH2-) in RaaiEt that gives a complex AB type multiplet with coupling constant of av. 6.6 Hz while in RaaiCH2Ph it shows AB type quartets with coupling constant of av. 6.2 Hz. Considering all the moitie there are a lot of different
carbon atoms in the molecule which gives a lot of eleven different peaks in the 13C {1H}NMR spectrum. In the 1H-1H COSY NMR spectrum of the present complexes and contour peaks in the 1H-13C HMQC NMR spectrum in the present complexes, assign the solution structure and stereo-retentive transformation in each step.
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