Publications in Scientific Journals:

A. Soliman, M.M. Khattab, M. Reissner, P. Weinberger, F. Werner, W. Linert:
"Synthesis, structure, spectroscopic and magnetic characterization of a novel spin-crossover iron(II) complex with 1-cyclopropyltetrazole ligands";
Inorganica Chimica Acta, 360 (2007), 3987 - 3996.

English abstract:
Synthesis, structure, spectroscopic and magnetic characterization of a novel spin-crossover iron(II) complex with 1-cyclopropyltetrazole ligands

Ahmed A. Solimana, Corresponding Author Contact Information, E-mail The Corresponding Author, Mohamed M. Khattabb, Michael Reissnernext termc, Peter Weinbergerd, Franz Wernerd and Wolfgang Linertd
aDepartment of Chemistry, Faculty of Science, Cairo University, Giza, Egypt
bDepartment of Chemistry, Faculty of Science, UAE University, Al-Ain, United Arab Emirates
cInstitute for Solid State Physics, Vienna University of Technology, Wiedner Hauptstraße 8-10/138, A-1040 Vienna, Austria
dInstitute of Applied Synthetic Chemistry, Vienna University of Technology, Getreidemarkt 9-163AC, A-1060 Vienna, Austria
Received 26 February 2007; revised 15 May 2007; accepted 20 May 2007. Available online 5 June 2007.


For the first time a 1-cyclopropyl substituted tetrazole (C3tz) has been used as a potential ligand for iron(II) spin-transition complexes. The complexation of 1-cyclopropyltetrazol with iron(II) tetrafluoroborate yielded a fine powdered product of [Fe(C3tz)6](BF4)2 being poorly soluble in most common solvents. Single crystals of complex were grown in situ from a solution of ligand and iron(II) hexafluorophosphate, which yielded a hexagonal prismatic crystalline product of [Fe(C3tz)6](PF6)2. A comparison of XRPD data of the homologues [Fe(C3tz)6](BF4)2 and [Fe(C3tz)6](PF6)2 proves them to be homeotypic. The thermally induced spin-crossover phenomenon of [Fe(C3tz)6](BF4)2 complex shows very abrupt spin transitions, with a spin-crossover temperature T1/2 ≈ 180 K which is found to be ≈50 K above the T1/2 of all known iron(II) complexes with n-alkyltetrazoles as ligands. The T1/2 was determined by temperature-dependent 57Fe-Mössbauer, far FT-IR and UV-Vis-NIR spectroscopy as well as temperature dependent magnetic susceptibility measurements (SQUID).

Spin crossover (SCO); 57Fe-Mössbauer; SQUID; X-ray diffraction; Far FT-IR; Spin transition; Iron(II); Cyclopropyltetrazole

"Official" electronic version of the publication (accessed through its Digital Object Identifier - DOI)

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