کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1309654 975216 2007 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The effect of halogen atom on the molecular quadratic nonlinearity of half sandwich complexes in the presence of an acceptor
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
The effect of halogen atom on the molecular quadratic nonlinearity of half sandwich complexes in the presence of an acceptor
چکیده انگلیسی

Half sandwich complexes of the type [CpM(CO)nX] {X = Cl, Br, I; If, M = Fe, Ru; n = 2 and if M = Mo; n = 3} and [CpNiPPh3X] {X = Cl, Br, I} have been synthesized and their second order molecular nonlinearity (β) measured at 1064 nm in CHCl3 by the hyper-Rayleigh scattering technique. Iron complexes consistently display larger β values than ruthenium complexes while nickel complexes have marginally larger β values than iron complexes. In the presence of an acceptor ligand such as CO or PPh3, the role of the halogen atom is that of a π donor. The better overlap of Cl orbitals with Fe and Ni metal centres make Cl a better π donor than Br or I in the respective complexes. Consequently, M–π interaction is stronger in Fe/Ni–Cl complexes. The value of β decreases as one goes down the halogen group. For the complexes of 4d metal ions where the metal–ligand distance is larger, the influence of π orbital overlap appears to be less important, resulting in moderate changes in β as a function of halogen substitution.

The quadratic nonlinear response of half-sandwich complexes having the X-M-L donor acceptor motif is found to vary with the π donor ability of the halogen atom ‘X’.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Inorganica Chimica Acta - Volume 360, Issue 8, 30 May 2007, Pages 2778–2782
نویسندگان
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