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Synthesis and Mössbauer Spectroscopy Studies on the Spin States of tris (2‐Pyridylimine) Iron(ii) Complexes
Author(s) -
Wei HoHsiang,
Hsiao ChingSung
Publication year - 1981
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.198100013
Subject(s) - chemistry , mössbauer spectroscopy , perchlorate , crystallography , spin states , ligand (biochemistry) , ground state , substituent , imine , tris , spin crossover , spin transition , spectroscopy , inorganic chemistry , medicinal chemistry , ion , organic chemistry , atomic physics , biochemistry , physics , receptor , quantum mechanics , catalysis
Some new tris (2‐pyridylimine) complexes of iron(II) such as FeL 3 X 2 (L = substituted imine ligand, 2‐py‐CR 1 =NR 2 , where R 1 or R 2 =H, CH 3 (Me) and C 4 H 5 (Ph), X=ClO 4 − or NCS − , have been synthesized and their electronic structures in the solid state examined by magnetic measurement and 57 Fe Mössbauer spectroscopic studies. All the perchlorate complexes FeL 3 (ClO 4 ) 2 are low‐spin electronic ground state of Fe(II). The dithiocyanato‐complexes, FeL 3 (NCS) 2 ; the spin states of Fe(II) are dependent on substituent R 1 and R 2 . The two complexes Fe(2‐py‐CH=NH) 3 (NCS) 2 and Fe(2‐py‐CPh=NH) 3 (NCS) 2 are spin‐intermediate (S=1) and Fe(2‐py‐CH=NPh) 3 (NCS) 2 shows a thermally inducing spin transition of 5 T⇄ 1 A 1 , whereas the other derivatives remain a low‐spin (S=0, 1 A 1 ) ground state of Fe(II) at three temperatures of 298, 202 and 78 K .