Synthesis of isotope enriched (CN3H6)2[57Fe(CN)5NO] starting from 57Fe

Christoph Janiak*, Thomas Dorn, Hauke Paulsen, Bernd Wrackmeyer

*Corresponding author for this work
8 Citations (Scopus)


A high-yield, mmolar-scale synthesis of pure guanidinium nitroprusside, (CN3H6)2[(57)Fe(CN)5NO] (GNP) from iron metal is described. The iron metal contained pieces of 95.3% 57Fe together with normal iron so that an isotope enrichment in 57Fe of 25% was achieved. Single-crystals of GNP could be grown in cubic shape and dimensions of about 3×4×4 mm3. The purity of the GNP product and the intermediates K4[(57)Fe(CN)6] · 3 H2O and Na2[(57)Fe-(CN)5NO] · 2 H2O was ascertained by 57Fe Mössbauer spectroscopy as well as 13C, 14N and 57Fe NMR spectroscopy. The 57Fe NMR chemical shift for [(57)Fe(CN)5NO]2- in GNP was detected at +2004.0 ppm [vs Fe(CO)5].

Original languageEnglish
JournalZeitschrift fur Anorganische und Allgemeine Chemie
Issue number7
Pages (from-to)1663-1668
Number of pages6
Publication statusPublished - 01.01.2001


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