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Spin-crossover compounds based on iron(ii) complexes of 2,6-bis(pyrazol-1-yl)pyridine (bpp) functionalized with carboxylic acid and ethyl carboxylic acidElectronic supplementary information (ESI) available: Structural views, thermal dependence of the unit cell parameters, powder X-ray diffraction patterns, thermogravimetric analysis, magnetic and photomagnetic properties and crystallographic data of the compounds. CCDC 1856804-1856814. For ESI and crystallographic data in CIF or other electronic
Four new salts of the iron( ii ) complex of the 2,6-bis(pyrazol-1-yl)pyridine ligand functionalized with a carboxylic acid group (bppCOOH) of formulas [Fe(bppCOOH) 2 ](BF 4 ) 2 ( 1(BF 4 ) 2 ), [Fe(bppCOOH) 2 ](CF 3 SO 3 ) 2 · y Me 2 CO ( 1(CF 3 SO 3 ) 2 · y Me 2 CO ), [Fe(bppCOOH) 2 ](AsF 6 ) 2 · y...
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| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
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| Summary: | Four new salts of the iron(
ii
) complex of the 2,6-bis(pyrazol-1-yl)pyridine ligand functionalized with a carboxylic acid group (bppCOOH) of formulas [Fe(bppCOOH)
2
](BF
4
)
2
(
1(BF
4
)
2
), [Fe(bppCOOH)
2
](CF
3
SO
3
)
2
·
y
Me
2
CO (
1(CF
3
SO
3
)
2
·
y
Me
2
CO
), [Fe(bppCOOH)
2
](AsF
6
)
2
·
y
Me
2
CO (
1(AsF
6
)
2
·
y
Me
2
CO
) and [Fe(bppCOOH)
2
](SbF
6
)
2
·
y
Me
2
CO (
1(SbF
6
)
2
·
y
Me
2
CO
) have been prepared and characterized together with a more complete structural and photomagnetic characterization of the previously reported [Fe(bppCOOH)
2
](ClO
4
)
2
(
1(ClO
4
)
2
). Furthermore, the iron(
ii
) complex of the ethyl ester derivative of bppCOOH (bppCOOEt) has been prepared and characterized (compound [Fe(bppCOOEt)
2
](ClO
4
)
2
·
y
Me
2
CO,
2(ClO
4
)
2
·
y
Me
2
CO
). Isostructural
1(BF
4
)
2
and
1(ClO
4
)
2
show an abrupt and reversible spin transition with a much lower
T
1/2
for the BF
4
−
salt. CF
3
SO
3
−
, SbF
6
−
and AsF
6
−
counteranions and the bppCOOEt ligand lead to the incorporation of solvent molecules in the structures, which play an important role in the spin-crossover properties of these compounds. In the case of
1(CF
3
SO
3
)
2
·
y
Me
2
CO
, a reversible spin transition is obtained after desolvation. All these compounds show a LIESST effect.
New salts of the iron(
ii
) bppCOOH and bppCOOEt spin crossover complexes have been studied. |
|---|---|
| ISSN: | 1477-9226 1477-9234 |
| DOI: | 10.1039/c8dt03511c |