[Zurück]

A.A. Soliman, M.M. Khattab, H. Abdelhady, I. Salitros, W. Linert:
"Synthesis, spectroscopic, thermal and magnetic characterization of novel spincrossover iron (II) complexes with 4-cyclopropyl-1,2,4-triazole";
Inorganica Chimica Acta, 418 (2014), S. 99 - 105.

The new bidentate ligand 4-cyclopropyl-1,2,4-triazole (4-C3trz) has been synthesised and used for preparing 1D Fe(II) SCO compounds of the formula [Fe(4-C3trz)3](X)2·nH2O; where: X=BF4 −, n=3 for compound (1) and X=ClO4 −, n=2 for compund (2). The new complexes (1) and (2) were characterized usingelemental analyses, IR-, mass spectroscopy and thermal analysis. The thermally induced spin-crossover behaviour of the complexes was inspected by temperature dependent magnetic susceptibility (SQUID) and DSC measurements.The results of magnetic susceptibility (SQUID) and DSC showed abrupt and complete spin transition with a hysteresis loop T_ 1/2= 230/222, T_ 1/2= 221/208 K for complex(1) and T_ 1/2= 218/193, T_ 1/2= 202/183 K for complex (2) using SQUID/DSC; respectively. The enthalpy and entropy associated with the spin transition (ST) evaluated by DSC results wereDtransH = +21.6 and +20.4 kJ mol-1 and DtransS = +97.5 and+105.5 J mol-1 K-1for the(1) and (2); respectively.

Iron (II) / Cyclopropyltriazole / Spin crossover (SCO) / SQUID / DSC

http://dx.doi.org/10.1016/j.ica.2014.04.017