Thermal and Photoinduced Spin Crossover in a Mononuclear Iron(II) Complex with a Bis(pyrazolyl)pyridine Type of Ligand

被引:25
|
作者
Salitros, Ivan [1 ,2 ]
Fuhr, Olaf [1 ]
Kruk, Robert [1 ]
Pavlik, Jan [2 ]
Pogany, Lukas [2 ]
Schaefer, Bernhard [1 ]
Tatarko, Miroslav [2 ]
Boca, Roman [2 ]
Linert, Wolfgang [3 ]
Ruben, Mario [1 ,4 ]
机构
[1] Karlsruher Inst Technol, Inst Nanotechnol, D-76021 Karlsruhe, Germany
[2] Slovak Univ Technol Bratislava, Fac Chem & Food Technol, Inst Inorgan Chem Technol & Mat, Bratislava 81237, Slovakia
[3] Vienna Univ Technol, Inst Appl Synthet Chem, A-1060 Vienna, Austria
[4] Univ Strasbourg, CNRS, IPCMS, F-67034 Strasbourg 2, France
关键词
Spin crossover; Iron; N ligands; Magnetic properties; Moessbauer spectroscopy; COORDINATION CHEMISTRY; MOLECULAR MATERIALS; TRANSITION; TEMPERATURE; SERIES; COMPOUND; PRESSURE; BEHAVIOR;
D O I
10.1002/ejic.201201123
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
A mononuclear iron(II) compound 1 of the general formula [Fe(L)(2)] (ClO4)(2) {L = 4-[2,6-bis(pyrazol-1-yl)pyridin-4-yl]-benzaldehyde} was prepared and structurally characterised. Single-crystal X-ray structure analysis revealed the presence of a complex dication [Fe(L)(2)](2+) and two ClO4- counteranions within the unit cell. The bond lengths and angles within the coordination polyhedron FeN6 indicate the low-spin state of the central iron(II) metal ion at T = 180 K. Magnetic investigations elucidate spin crossover with T-1/2 = 285 K. The experimental magnetic susceptibility data could be satisfactorily fitted with the Curie law in combination with the Ising-like model. The room-temperature character of the spin crossover was further studied by variable-temperature far-IR, Vis and Mossbauer spectroscopy. Laser irradiation of 1 carried out at 10 K gives rise to a complete low-spin to high-spin photoconversion. A subsequent temperature-dependent investigation revealed the existence of a photoexcited metastable HS state up to T-LIESST = 70K (LIESST = light-induced excited-spin-state trapping) as well as the presence of a light-induced thermal hysteresis loop with a width of 10 K.
引用
收藏
页码:1049 / 1057
页数:9
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