Iron(II) spin-transition complexes with dendritic ligands, part II

Wei, YongLi, Sonar, Prashant, Grunert, Matthias, Kusz, Joachim, Schlüter, A. Dieter, & Gütlich, Philipp (2010) Iron(II) spin-transition complexes with dendritic ligands, part II. European Journal of Inorganic Chemistry, 2010(25), pp. 3930-3941.

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The dendritic triazole-based complexes [Fe(G1-BOC)3](triflate) 2·xH2O (1; G1-BOC = tert-butyl {3-[3-(3-tert- butoxycarbonylaminopropyl)-5-([1,2,4]triazol-4-ylcarbamoyl)-phenyl]propyl} carbamate, triflate = CF3SO3-), [Fe(G1-BOC) 3]-(tosylate)2·xH2O(2;tosylate = p-CH3PhSO3-),[Fe(G1-DPBE)3]-(triflate) 2·xH2O {3; G1-DPBE = 3,5-bis(3,5- didodecaoxybenzyloxy)-N-[1,2,4]triazol-4-ylbenzamide}, [Fe(G1-DPBE) 3]-(tosylate)2·xH2O (4) and [Fe(G1-DPBE)3](BF4)2·xH2O (5) were designed and synthesized. Magnetic and thermal properties of these novel complexes were characterized by magnetic susceptibility measurements, 57Fe Mössbauer spectroscopy and thermogravimetric analysis or differential scanning calorimetry, respectively. All dendritic complexes under study show different spin-transition behaviour with respect to the nature of different dendritic ligands and counteranions. Complexes 1 and 2 have pronounced effects of a spin-state change during the first heating process and gradual spintransition properties for further temperature treatments, whereas 3 and 4 exhibited a very sharp spin-state change in the first heating procedures. Complex 5 showed a gradual spin-transition curve. In this paper, we report how the magnetic properties of these complexes are correlated with noncoordinated water molecules and their effects on spin states.

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ID Code: 75265
Item Type: Journal Article
Refereed: Yes
Keywords: Dendrimers, Iron, Magnetic properties, Moessbauer spectroscopy, Spin crossover
DOI: 10.1002/ejic.201000067
ISSN: 1434-1948
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2010 Wiley-VCH Verlag GmbH&Co. KGaA, Weinheim.
Deposited On: 02 Oct 2014 22:37
Last Modified: 18 Jan 2016 04:49

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