Rare earth complexes

Details Rare earth complexes Rare earth complexes

1999-09-10

2001-10-09

Jones, Dameron L. (Department: 1619)

Organic compounds -- part of the class 532-570 series

Organic compounds

Carbohydrates or derivatives

C534S015000

Reexamination Certificate

active

06300481

ABSTRACT:

This is a 371 of Application No. PCT/JP98/00970, filed Mar. 10, 1998.
TECHNICAL FIELD
The present invention relates to rare-earth complexes, ligands useful for these complexes, optically functional materials comprising the rare-earth complex, and a process for preparing the rare-earth complex.
BACKGROUND ART
With remarkable advances in developing electronic materials, many developments have been made in optically functional materials in the field of optoelectronics. For example, neodymium-containing glass has been introduced into actual use in laser beam electronic devices, whereas the glass has found only limited use because of the difficulties encountered in producing and working the glass and a high production cost. The dye laser, which can be used in the form of a solution, has the excellent features of being inexpensive, easy to work and cool and continuously usable for a prolonged period of time. However, the dye laser is low in strength and therefore limited in application.
On the other hand, organic optical materials such as polyphenylene have the drawback of being short in luminescence life and diminished in the effectiveness of luminescence although superior to inorganic optical materials in workability.
It is already known that a complex [Nd
III
(HFA)
3
] comprising Nd
3+
and three molecules of hexafluoroacetylacetone (HFA) coordinated therewith and having heavy hydrogen substituted for the hydrogen of active methylene luminesces in the state of a solution [S. Yanagida et al., J. Phys. Chem., 100, 10201(1996)]. This complex is short in luminescence life and low in quantum yield and decomposes in the presence of a very small amount of water to lose its optical conversion function. It has therefore been desired to develop complexes having a high luminescence intensity and good stability.
An object of the present invention is to provide rare-earth complexes having excellent luminescence characteristics, compounds useful as ligands for these complexes, optically functional materials containing the rare-earth complex and a process for preparing such rare-earth complexes.


REFERENCES:
patent: 5554664 (1996-09-01), Lamanna et al.
Allen R. Siedle, Richard A. Newmark, Louis H. Pignolet and Richard D. Howells, Protonation of Organometallic Hydrdes with Fluorochemical Acids, Journal of Americna Chemical Society (1984), vol. 106, pp. 1510-1511.

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