Details
| Original language | English |
|---|---|
| Pages (from-to) | 194-201 |
| Number of pages | 8 |
| Journal | POLYHEDRON |
| Volume | 87 |
| Publication status | Published - 17 Feb 2015 |
Abstract
Two novel iron(III) complexes involving pentadentate Schiff-base ligands, [Fe(LBr)(L1)], show temperature induced incomplete spin crossover of a gradual nature. While for the L1 = NCSe- coligand the transition temperature (326 K or 317 K) lies above room temperature, the N3- coligand causes its drop down to 143 K or 140 K (two values were obtained by different models). This shift is associated with a significant decrease of the enthalpy of the transition from about ΔH = 6.1 kJ mol-1 to ca. ΔH = 1.7 kJ mol-1, while the entropy of the transition is about ΔS = 19 J K-1 mol-1 and ΔS = 12 J K-1 mol-1, respectively. Two analogous complexes with Cl- and NCS- coligands remain high-spin over the whole temperature range.
Keywords
- Iron(III) complexes, Ising-like model, Pseudohalides, Schiff-base ligand, Spin crossover
ASJC Scopus subject areas
- Chemistry(all)
- Physical and Theoretical Chemistry
- Chemistry(all)
- Inorganic Chemistry
- Materials Science(all)
- Materials Chemistry
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In: POLYHEDRON, Vol. 87, 17.02.2015, p. 194-201.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Iron(III) complexes with pentadentate Schiff-base ligands
T2 - Influence of crystal packing change and pseudohalido coligand variations on spin crossover
AU - Krüger, Christoph
AU - Augustín, Peter
AU - Dlháň, L'Ubor
AU - Pavlik, Ján
AU - Moncol', Ján
AU - Nemec, Ivan
AU - Boča, Roman
AU - Renz, Franz
N1 - Funding Information: Grant Agencies (Slovakia: VEGA-1/0233/12, APVV-0014-11, APVV-0132-11; Germany: DAAD SK/DE; Czech Republic: PrF_2014_09) are acknowledged for the financial support.
PY - 2015/2/17
Y1 - 2015/2/17
N2 - Two novel iron(III) complexes involving pentadentate Schiff-base ligands, [Fe(LBr)(L1)], show temperature induced incomplete spin crossover of a gradual nature. While for the L1 = NCSe- coligand the transition temperature (326 K or 317 K) lies above room temperature, the N3- coligand causes its drop down to 143 K or 140 K (two values were obtained by different models). This shift is associated with a significant decrease of the enthalpy of the transition from about ΔH = 6.1 kJ mol-1 to ca. ΔH = 1.7 kJ mol-1, while the entropy of the transition is about ΔS = 19 J K-1 mol-1 and ΔS = 12 J K-1 mol-1, respectively. Two analogous complexes with Cl- and NCS- coligands remain high-spin over the whole temperature range.
AB - Two novel iron(III) complexes involving pentadentate Schiff-base ligands, [Fe(LBr)(L1)], show temperature induced incomplete spin crossover of a gradual nature. While for the L1 = NCSe- coligand the transition temperature (326 K or 317 K) lies above room temperature, the N3- coligand causes its drop down to 143 K or 140 K (two values were obtained by different models). This shift is associated with a significant decrease of the enthalpy of the transition from about ΔH = 6.1 kJ mol-1 to ca. ΔH = 1.7 kJ mol-1, while the entropy of the transition is about ΔS = 19 J K-1 mol-1 and ΔS = 12 J K-1 mol-1, respectively. Two analogous complexes with Cl- and NCS- coligands remain high-spin over the whole temperature range.
KW - Iron(III) complexes
KW - Ising-like model
KW - Pseudohalides
KW - Schiff-base ligand
KW - Spin crossover
UR - http://www.scopus.com/inward/record.url?scp=84918840283&partnerID=8YFLogxK
U2 - 10.1016/j.poly.2014.11.014
DO - 10.1016/j.poly.2014.11.014
M3 - Article
AN - SCOPUS:84918840283
VL - 87
SP - 194
EP - 201
JO - POLYHEDRON
JF - POLYHEDRON
SN - 0277-5387
ER -