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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 15, Number 7
BKCSDE 15(7)
July 20, 1994 

Synthesis and Characterization of Dichloro and Dibromo(2-(dimethylaminomethyl)thiophene) Copper (Ⅱ) Complexes
Young Inn Kim*, Sung Nak Choi, Chul Un Ro
The 2-(dimethylaminomethyl)thiophene (dmamt) complexes with copper(Ⅱ) chloride and bromide were prepared and characterized by optical, EPR, XPS spectroscopies and magnetic susceptibility measurements. The low-energy absorption band above 850 nm and the relatively small EPR hyperfine coupling constant (A// 125 G) indicate the pseudotetrahedral site symmetry around copper(Ⅱ) ion both in Cu(dmamt)Cl2 and Cu(dmamt)Br2 complexes. The higher satellite to main peak intensity of Cu 2P3/2 core electron binding energy in XPS spectra also supports the pseudotetrahedral geometry around the copper(Ⅱ) ions having CuNSX2 chromophores. The distortion from square-planar to pseudotetrahedral symmetry is likely to arise from the steric hindrance of the bulky dmamt ligand in the complex. Magnetic susceptibility study shows that these compounds follow Curie-Weiss law in the temperature range of 77-300 K with positive Weiss constant exhibiting the ferromagnetic interaction between copper(Ⅱ) ions in solid state.
549 - 553
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