Preferred Label : spin crossover;
IUPAC definition : A type of molecular magnetism that is the result of electronic instability (see electronic
stability) caused by external constraints (temperature, pressure, or electromagnetic
radiation), which induce structural changes at molecular and lattice levels. The phenomenon
is most characteristic of first-row transition metal complexes, i e.g. /i those
of Fe sup II /sup . An example of spin-crossover complexes (the term of spin-state
isomers is also used) is [Fe(2-pic) sub 3 /sub ]Cl sub 2 /sub ·EtOH (2-pic 2-picolylamine).
At the Fe–N distance of 203.2 pm (115 K), the complex has an electronic low-spin state
( sup 1 /sup A sub 1 /sub ), whereas stretching the bond up to 219.9 pm at 227 K induces
the transition to a high-spin state ( sup 5 /sup T sub 2 /sub ).;
Origin ID : ST07104;
See also
A type of molecular magnetism that is the result of electronic instability (see electronic
stability) caused by external constraints (temperature, pressure, or electromagnetic
radiation), which induce structural changes at molecular and lattice levels. The phenomenon
is most characteristic of first-row transition metal complexes, i e.g. /i those
of Fe sup II /sup . An example of spin-crossover complexes (the term of spin-state
isomers is also used) is [Fe(2-pic) sub 3 /sub ]Cl sub 2 /sub ·EtOH (2-pic 2-picolylamine).
At the Fe–N distance of 203.2 pm (115 K), the complex has an electronic low-spin state
( sup 1 /sup A sub 1 /sub ), whereas stretching the bond up to 219.9 pm at 227 K induces
the transition to a high-spin state ( sup 5 /sup T sub 2 /sub ).
