| Budget Amount *help |
¥3,250,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥150,000)
Fiscal Year 2007: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2006: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2005: ¥2,000,000 (Direct Cost: ¥2,000,000)
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| Research Abstract |
Molecular glasses (glassy states comprising low molecular-weight compounds) are regarded as functional materials for molecular design and characterization in comparison with macromolecular glasses. Particularly, molecular glasses of metal complexes have many advantageous features as functional materials due to various reactivities and structures, whereas studies on such systems have been rarely reported. Our research group has found that the acylaminocarboxylate-lanthanide (III) complexes readily form glassy states by an evaporation of solvents from solutions. The present categories of metal complexes seem to have a beneficial feature for a systematic study concerning the relationship between the molecular structure and the extent of the ordering of the molecular aggregation.
Our project is composed of the following three parts. 1) Formation of glassy states of octanoylalaninate complexes of yttrium, lanthanum, and calcium and the aggregation behavior in methanol and chloroform. 2) Anal
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ogous studies for europium(III) and terbium(III) complexes relating with the luminescent properties. 3) Formation of ionic liquids comprising of silver alkylethylenediamine complexes. Although the last subject does not seem to be directly related with the present project, the mysterious state of ionic liquids has been recently clarified to be closely correlated with the formation of molecular glassy. In the subjects of 1) and 2), the glassy states were characterized using DSC, TG-DTA, WAXS, SAXS, solid-state NMR spectroscopy, and EXAFS. The structures in the solid states were related with concentrated solutions whose properties were studied by NMR, SAXS, and EXAFS, and the process of the glassy formation from the concentrated solutions was revealed. The glassy state was understood as a result of isotropic aggregation in solution. The luminescent properties of the europium and tedium complexes were appropriate probes for monitoring the aggregation process and could be related with the results of NMR studies. It is remarkable that the europium and lanthanum complexes having phenylalaninate and serinate headgroups showed a novel liquid-crystalline glassy state. Less
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