| Autor: |
Haase, W., Reyes, V., Athanassopoulou, M., Garrido, G., Griesar, K., Schumacher, E. |
| Zdroj: |
Molecular Engineering; Dec1993, Vol. 2 Issue 4, p321-327, 7p |
| Abstrakt: |
The synthesis, characterization, thermal behavior and magnetic properties of a number of bis[2′-(4-alkyloxyphenyl)malondialdehyde] nickel(II) complexes are reported. X-ray studies of the nickel(II) complexes were performed. It was found that the nickel(II) complexes show liquid-crystalline smectic A phases over a broad temperature range with low melting points. The temperature-dependent magnetic susceptibility measurements of the bis[2′-(4-decyloxyphenyl)malondialdehyde] nickel(II) complex were carried out in the range of 4.2-480 K. The temperature dependent magnetic susceptibilities and magnetic moments of this compound (μ=3.27 μ at 300 K) indicate that the nickel centers are octahedrally coordinated. Models for the molecular arrangement in the crystalline and liquid-crystalline phases are discussed on the basis of the magnetic data. In spite of the oxygen bridge between the nickel centers, no exchange interactions were found in the crystalline and liquid-crystalline phases. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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