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The Hexakis(thiocyanato)ferrate( III ) Ion: a Coordination Chemistry Classic Reveals an Interesting Geometry Pattern for the Thiocyanate Ligands
Author(s) -
Addison Anthony W.,
Butcher Raymond J.,
Homonnay Zoltán,
Pavlishchuk Vitaly V.,
Prushan Michael J.,
Thompson Laurence K.
Publication year - 2005
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200400867
Subject(s) - chemistry , thiocyanate , monoclinic crystal system , crystallography , coordination geometry , electron paramagnetic resonance , ion , coordination complex , mössbauer spectroscopy , infrared spectroscopy , copper , crystal structure , stereochemistry , inorganic chemistry , molecule , metal , nuclear magnetic resonance , hydrogen bond , organic chemistry , physics
(NMe 4 ) 3 [Fe(NCS) 6 ] crystallizes from ethanol in the monoclinic space group C 2/ c . Two different types of complex ions are contained in the unit cell, though both possess exclusively N ‐coordination of the thiocyanate ligands. In one ion, the thiocyanate ligands are all essentially linearly bound, with an Fe–N–C angle of 174 ± 4°, while in the other, there are two cis ‐thiocyanate ligands with a notably small Fe–N–C angle of 146.5°. The EPR and Mössbauer results show that all the iron( III ) centers maintain the high‐spin state down to 80 K, while the magnetic susceptibility confirms this to 2 K. Infrared and Mössbauer spectra provide evidence for an unusually “soft” lattice. Traditional criteria for interpretation of the infrared frequencies are not strictly applicable for this compound. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)