Open AccessCarboxylate Substitution Pattern as Structural Directive for the Final Products: Synthesis, Structure And Properties of [Fe4Ca2O2(μ2-HCCl2COO)10(μ3-HCCl2COO)2(THF)6]
Author(s) -
Denis Prodius,
Valeriu Mereacre,
Мaria Gdaniec,
Sergiu Shova,
Yurii A. Simonov,
Nicolae Stănică,
Geru Ion,
Andrea Caneschi,
Constantin Turta
Publication year - 2008
Publication title -
chemistry journal of moldova
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.275
H-Index - 5
eISSN - 2345-1688
pISSN - 1857-1727
DOI - 10.19261/cjm.2008.03(2).06
Subject(s) - chemistry , antiferromagnetism , mössbauer spectroscopy , crystallography , denticity , carboxylate , electron paramagnetic resonance , excited state , ground state , substitution (logic) , crystal structure , magnetic susceptibility , spectroscopy , stereochemistry , nuclear magnetic resonance , condensed matter physics , atomic physics , computer science , programming language , physics , quantum mechanics
A novel hexanuclear iron-calcium-oxo complex has been synthesized and characterized by different physico-chemical methods and X-ray single crystal structural analysis: [Fe4Ca2O2(μ2-HCCl2COO)10(μ3-HCCl2COO)2(THF)6].The molecular structure shows that there are two types of coordination for COO- anions: bidentate and tridentate. The corresponding variable temperature susceptibility measurement shows that in the complex there exists an antiferromagnetic interaction (|J12| = |J34| = -71.86 cm-1). The iron(III) high spin state (5/2) is proved by Mössbauer spectroscopy. High magnetic EPR measurements of 1 indicates the presence of S=0 ground state with low-lying S=1 excited state centred around g = 2.0054 ±0.0001.