کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1339631 979711 2008 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Single-crystal electronic spectra of some quadrate chromium(III) complexes
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Single-crystal electronic spectra of some quadrate chromium(III) complexes
چکیده انگلیسی

Polarised electronic spectra of trans-[Cr(tmd)2F2](ClO4), trans-[Cr(en)2(dma)2](ClO4)3, trans-[Cr(en)2(dmf)Cl](ClO4)2 and trans-[Cr(en)2(dmf)Br](ClO4)2 have been measured at 77 K (tmd = trimethylenediamine; dma = N,N-dimethylacetamide; dmf = N,N-dimethylformamide; en = ethylenediamine, pn = propylenediamine). The observed quartet bands have been given definitive quadrate assignments based on polarisation characteristics. The four-component quadrate quartet bands have been uncovered and assigned also in the unpolarised crystal spectrum of trans-[Cr(en)2(dmf)2](ClO4)3 at 77 K and the solution spectrum of trans-[Cr(en)(pn)F2]+. The band maxima derived by gaussian analysis in these spectra have been fitted with the theoretical energy equations of d3 configuration in quadrate ligand fields including full configuration interaction. The ligand field parameters Dq, Dt, and Ds and the election correlation parameter, B, extracted by such a fitting, have been compared with those obtained for other similar systems earlier. The significance of the ligand field symmetry parameters and the translated angular overlap model parameters is discussed.

Polarised, single-crystal, electronic spectra of a number of trans-disubstituted bis(ethylenediamine) chromium(III) complexes have been measured at 77 K. The observed quartet bands have been given definitive quadrate assignments based on polarisation characteristics. The significance of the ligand field symmetry parameters and the translated angular overlap model parameters is discussed.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polyhedron - Volume 27, Issue 2, 6 February 2008, Pages 523–529
نویسندگان
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