Synthesis and properties of metal–mesogenic nanostructures
Formation of metal–organic nanostructures in co-condensate films have been studied during low temperature codeposition of metal and organic component vapours using a new class of mesogenic ligands-long chain alkyl(alkoxy)cyanobiphenyls (CB): C n H 2 n+1 –C 6H 5–C 6H 5–CN, where n=5 (5 CB), 8 (8 CB),...
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Published in | Materials Science & Engineering C Vol. 8; pp. 53 - 56 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
01.12.1999
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Subjects | |
Online Access | Get full text |
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Summary: | Formation of metal–organic nanostructures in co-condensate films have been studied during low temperature codeposition of metal and organic component vapours using a new class of mesogenic ligands-long chain alkyl(alkoxy)cyanobiphenyls (CB): C
n
H
2
n+1
–C
6H
5–C
6H
5–CN, where
n=5 (5 CB), 8 (8 CB), and C
n
H
2
n+1
O–C
6H
5–C
6H
5–CN,
n=8 (8 OCB). The existence of low temperature Ag-5CB complexes was shown by IR–UV–Visible and ESR techniques. By performing ab initio quantum chemistry calculations including partial geometry optimization and vibrational analysis for the sandwich-like cyanobenzene–silver complexes, it is shown that the observed red shifts in the CN stretching region of the IR spectra of silver–cyanobiphenyl condensate films is a consequence of the formation of the π-complexes. Thermal degradation of the complexes by annealing of the samples at 200–300 K led to the formation of nanosize (15–30 nm) silver particles incorporated in anisotropic CB-structure and their further aggregation in mesogenic matrices. |
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ISSN: | 0928-4931 1873-0191 |
DOI: | 10.1016/S0928-4931(99)00042-9 |