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Thermal‐, Pressure‐, and Light‐Induced Spin Transition in Novel Cyanide‐Bridged Fe II Ag I Bimetallic Compounds with Three‐Dimensional Interpenetrating Double Structures {Fe II L x [Ag(CN) 2 ] 2 }⋅G
Author(s) -
Niel Virginie,
Muñoz M. Carmen,
Gaspar Ana B.,
Galet Ana,
Levchenko Georg,
Real José Antonio
Publication year - 2002
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/1521-3765(20020603)8:11<2446::aid-chem2446>3.0.co;2-k
Subject(s) - spin transition , spin crossover , crystallography , bimetallic strip , microcrystalline , excited state , thermal hysteresis , spin (aerodynamics) , spin states , chemistry , materials science , cyanide , condensed matter physics , phase transition , inorganic chemistry , atomic physics , organic chemistry , catalysis , physics , aerospace engineering , engineering
Low‐spin, high‐spin and spin‐transition behaviours have been observed for the doubly interpenetrating three‐dimensional bimetallic compounds {Fe II (pz)[Ag(CN) 2 ] 2 }.pz (pz=pyrazine), {Fe II (4,4′‐bipy) 2 [Ag(CN) 2 ] 2 } (4,4′‐bipy=4,4′‐bipyridine), and {Fe II (bpe) 2 [Ag(CN) 2 ] 2 } (bpe=bispyridylethylene), respectively. The single crystals of the bpe derivative undergo a spin transition with a large hysteresis loop at about 95 K. After several warming and cooling cycles, the single crystals become a microcrystalline powder with 50 % spin transition. Influence of pressure‐ as well as light‐induced excited spin‐state trapping (LIESST) on the thermal 50 % spin transition of the microcrystalline sample has also been investigated. Thermal spin‐transition behaviour has also been induced at pressures higher than 1 bar for the 4,4′‐bipy derivative. Both the 4,4′‐bipy and bpe derivatives show strong pressure dependence of the spin state at 300 K.