DXAS electronic and structural characterization of nitroprussides

M. CEOLÍN; D. B. SORIA; M.A. TAYLOR

Italia

Conferencia; 14th International Conference on X-ray absorption fine structure; 2009

<!-- /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {mso-style-parent:""; margin:0cm; margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:12.0pt; font-family:"Times New Roman"; mso-fareast-font-family:"Times New Roman"; mso-ansi-language:EN-US;} @page Section1 {size:612.0pt 792.0pt; margin:70.85pt 3.0cm 70.85pt 3.0cm; mso-header-margin:36.0pt; mso-footer-margin:36.0pt; mso-paper-source:0;} div.Section1 {page:Section1;} --> Several studies including the crystallographic, thermal and vibrational properties of a series of hydrated and anhydrous alkaline and alkaline-earth pentacyanonitrosylferrate, [Fe(CN)5NO]2- , have been previously performed (1-3 and references therein). These studies provided interesting results specially regarding the vibrational and photo-behavior of the NO group. However their structural and electronic changes triggered during thermal degradation are not well known. In view of the findings already mentioned about the nitroprusside anion and their salts and to obtain information in other pentacyanonitrosylmetallates, our main purpose is to extend the study to their alkaline and transitions metals salts focusing on the thermal evolution of the local and electronic structure observed from the metallic sites. In this work, we present a systematic and extensive investigation of the thermal decomposition of the different complexes with general formula  Am[B(CN)5NO]n  where A= K, Co, B= Fe, Cr, Mn,  m=1,3 and n= 1,2 using EXAFS, XANES, XRD, DTA, TGA and FTIR.