Discotic Liquid Crystals of Transition Metal Complexes VI. Monotropic Lamella Mesomorphism of Tetrakis(N-Alkyldithiolato)Dinickel(II) and Bis(N-Alkylxanthato)Nickel(II) Complexes
作者:
Kazuchika Ohta,
Hiroshi Ema,
Iwao Yamamoto,
Kei Matsuzaki,
期刊:
Liquid Crystals
(Taylor Available online 1988)
卷期:
Volume 3,
issue 12
页码: 1671-1687
ISSN:0267-8292
年代: 1988
DOI:10.1080/02678298808086629
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
It was found that each of the tetrakis(n-alkyldithiolato)dinickel(II), (Cn-DTA)4-Ni2, complexes wheren-alkyl isn-pentyl throughn-dodecyl, exhibits a broken-fan texture on cooling from an isotropic liquid, and that the phase gave a characteristic lamella structure X-ray diffraction powder pattern. Furthermore, the infrared spectrum of this phase is more similar to that of the isotropic liquid than that of the crystal. Therefore, the phase can be described as a monotropic lamella mesophase. Interestingly, each of the complexes of bis(n-alkylxanthato)nickel(II), (Cn-Xan)2Ni, (n= 5, 7, 9, 11) exhibits double (triple) melting behavior via the isotropic liquid, whereas each of the complexes of (Cn-Xan)2Ni (n= 4, 6, 8, 10, 12) shows ordinary single melting behavior. Such unique double melting accompanied by an even-odd effect appears to be the first example of this in the long chain substituted compounds. Each of the complexes of (Cn-Xan)2Ni (n= 9, 11, 12) has a monotropic lamella mesophase exhibiting a large broken fan texture.
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