Crystal and Molecular Structure and Photoisomerization of Nitropentaammine cobalt(III) Nitroprusside Sesquihydrate, [Co(NH3)5NO2][Fe(CN)5NO]„ª1.5 H2O

D. B. SORIA; M. E. CHACÓN VILLALBA; O. E. PIRO; P. J. AYMONINO

POLYHEDRON

Elsevier

Año: 2002 vol. 21 p. 1767 - 1774

0277-5387

Abstract             The crystal structure of nitropentaamminecobalt(III) nitroprusside sesquihydrate,  [Co(NH3)5NO2][Fe(CN)5NO]×1.5H2O has been determined by Patterson and Fourier methods employing 3881 independent x-ray reflections with I > 2s(I) and refined by full-matrix least-squares to R1 = 0.032. The substance crystallizes in the monoclinic C2/c ( ) space group N° 15, with a= 28.408(3), b= 6.422(1), c= 22.401(3) Å, b = 123.55(1)° and Z = 8. The metastable state I (MSI) of the nitroprusside anion and the photochemical isomerization reaction of the nitropentaamminecobalt(III) cation to the nitrito isomer were produced by irradiation with Ar+ laser light of 488 nm wavelength  at 77 K. TGA and DTA of the non-excited substance were performed  under nitrogen atmosphere.