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BERNARD, R. CORNU, D. BALDECK, P. L. ČÁSLAVSKÝ, J. LETOFFE, J. M. SCHARFF, J. P. MIELE, P.
Original Title
Synthesis, characterization and optical properties of π-conjugated systems incorporating closo-dodecaborate clusters: new potential candidates for two-photon absorption processes
Type
journal article - other
Language
English
Original Abstract
Non-centrosymmetric pi-conjugated systems incorporating closo-dodecaborate clusters, [NC - C6H4 - C(H)= N( H) - B12H11](-) ( 2), [NC - C6H4 - C( H)= C( H) - C6H4 - C( H)= N( H) - B12H11](-) ( 3), and [ NC - C6H4 - C( H)= C( H) - C6H4 - C( H)= C( H) - C6H4 - C( H)= N( H) - B12H11]- ( 4) have been synthesized by reaction of the monoamino derivative of B-12, [B12H11NH3](-) ( 1), with various arylaldehydes, R - C6H4 - CHO. These Schiff base-like compounds were fully characterized by multinuclear NMR spectroscopy and mass spectrometry. In order to evaluate these boron rich pi-systems as potential materials for two-photon absorption (TPA) processes, UV linear absorption curves were recorded for 3 and 4, and comparatively studied with those of the boron-free pi-systems NC - C6H4 - C(H)= N - CH3 ( 5) and NC - C6H4 - C( H)= C( H) - C6H4 - C( H)= N - CH3 (6). The donor effect of the boron cluster was evidenced by a shift to the lower energy of the absorption band in the spectra of systems incorporating B-12. The two photon absorption ( TPA) spectrum of compound 3, obtained by the up-conversion method, shows a resonance at 720 nm with a cross-section sigma(TPA) of 35 x 10(-50) cm(4) s photon(-1) molecule(-1). This value suggests the potential of B-12 clusters to be used as new donor groups for the synthesis of non-linear materials.
Keywords
charged aromatic donors; cross-sections; single-photon; trivalent boron; derivatives; chemistry; anion; fluorescence; acceptor; boranes
Authors
BERNARD, R.; CORNU, D.; BALDECK, P. L.; ČÁSLAVSKÝ, J.; LETOFFE, J. M.; SCHARFF, J. P.; MIELE, P.
Released
8. 8. 2005
ISBN
1477-9226
Periodical
DALTON TRANSACTIONS
Number
18
State
United Kingdom of Great Britain and Northern Ireland
Pages from
3065
Pages to
3071
Pages count
7
BibTex
@article{BUT115502, author="BERNARD, R. and CORNU, D. and BALDECK, P. L. and ČÁSLAVSKÝ, J. and LETOFFE, J. M. and SCHARFF, J. P. and MIELE, P.", title="Synthesis, characterization and optical properties of π-conjugated systems incorporating closo-dodecaborate clusters: new potential candidates for two-photon absorption processes", journal="DALTON TRANSACTIONS", year="2005", number="18", pages="3065--3071", doi="10.1039/b504414f", issn="1477-9226" }