| Autor: |
Thekkel M. Rajendiran, Ramu Kannappan, Rajaram Mahalakshmy, Janarthanam Rajeswari, Rangarajan Venkatesan, Pillutla Rao |
| Zdroj: |
Transition Metal Chemistry; May2003, Vol. 28 Issue 4, p447-454, 8p |
| Abstrakt: |
A series of binuclear CuII complexes [Cu2XL]n+ having two copper(II) ions bridged by different motifs (X = OH−, MeCO2−, or Cl−) have been prepared using the ligands: H2L1 = 4-methyl-2-[N-(2-{dimethylamino}ethyl-N'-methyl)aminomethyl]-6-[(prolin-1-yl)methyl]phenol, H2L2 = 4-nitro-2-[N-(2-{dimethylamino}ethyl-N'-methyl)aminomethyl]-6-[(prolin-1-yl)methyl]phenol, H2L3 = 4-methyl-2-[N-(2-{diethylamino}ethyl-N'-ethyl)aminomethyl]-6-[(prolin-1-yl)methyl]phenol and H2L4 = 4-nitro-2-[N-(2-{diethylamino}ethyl-N'-ethyl)aminomethyl]-6-[(prolin-1-yl)methyl]phenol. The complexes have been characterized by spectroscopic, analytical, magnetic and electrochemical measurements. Cryomagnetic investigations (80300 K) revealed anti-ferromagnetic exchange between the CuII ions (−2J in the range −50 to −182 cm−1). The strength of anti-ferromagnetic coupling lies in the order: OAc > OH > Cl. Cyclic voltammetry revealed the presence of two redox couples, assigned to CuII/CuII/CuII/CuI/CuI/CuI. The first reduction potential is sensitive to electronic effects from the aromatic ring substituents and steric effect on the donor nitrogens (side arm) of the ligand systems. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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