Abstract:
The synthesis and characterization of some new complex of Mn (II)
with organic ligands derived from morpholine-4-carbodithioic acid 2-(3,5
diiodo-2-hydroxy-phenyl)-2-oxo-ethyl ester is reported in this paper. The
morpholine-4-carbodithioic acid 2-(3, 5-diiodo-2-hydroxy-phenyl)-2-oxo
ethyl ester was utilized as solution, in an ethylic alcohol-water medium (1:1,
v: v) while the Mn (II) as a fresh aqueous solution of MnCl2.4H2O. . The
complex is insoluble in the reaction medium and was separated by filtering.
Elemental analysis, ESR, FTIR spectroscopy and thermal analysis
performed the characterization of this complex compound. The IR spectra
were recorder between 200 cm-1 and 4000 cm-1 using a spectrometer FTIR
660 Plus by the method of KBr pelleting. Study of the IR spectra evidenced
the functional groups of complex and the chemical analysis showed that the
combination rate of M:L is 1:2 (C13H12O3S2NI2)2Mn. The ESR spectra were
recorder on solid samples with RES-IFA Bucharest spectrometer. Intensity of
magnetic field was 3216.9 Gauss at 9030 MHz frequency. ESR spectra
evidenced five odd electrons in inner coordination sphere compound being
paramagnetic.
The obtained precipitate was submitted thermogravimetric analysis
using MOM Q -1500D derivatograph to 1000OC. Until 850C, complex is
stable but between 850C-2700C there are three loss masses. One
corresponding waters molecules loss and the second corresponding thermal
degradation of parts from ligands. The last loss mass corresponding
formation of manganese oxide. Up to 270oC, the decomposition product is
stable from thermal point of view. Based on experimental data and literature
indications the structural formula of this compound is assigned.
Hybridization of manganese ion is sp3 type and the space configuration is
thetraedrical, with two coordination liaisons from two oxygen atoms and two
covalent liaisons between copper ion and other two oxygen atoms.
