Design and syntheses of efficient and thermally stable diamino chromophores for NLO application

Abstract

A novel series of diamino imidazole-type chromophores has been synthesized, which can be chemically incorporated into polymer matrices. Furthermore, their molecular optical nonlinearity, transparency and thermal stability were determined and studied comparatively. Theoretical calculation and experimental results indicate that good nonlinearity-transparencythermal stability is well balanced in chromophore 4, which possesses a µ g β 0 of 554.8×10-48 esu, a rather blue-shifted absorption peak at 384 nm in THF, and a high decomposition temperature T d of 377°C. It is strongly suggested from these results that multiple substitution strategy should be useful for designing novel NLO chromophores.

Imidazole as a parent π-conjugated backbone in charge-transfer chromophores

“…A similar synthetic strategy is used for the construction of diimidazole-type push–pull systems bearing two imidazole rings, which serve as donor and acceptor moieties [ 16 – 19 ]. A sequential construction of the chromophore backbone by modern cross-coupling reactions represents another synthetic approach used for the synthesis of superior diimidazole chromophores [ 20 ].…”

“… Y-shaped CT chromophores with an extended π-conjugated pathway and various donor and acceptor substitution patterns [ 16 , 33 – 35 ]. …”

“…Wu et al utilized 4,5-bis(4-aminophenyl)imidazole as a suitable donor moiety for the construction of the nitro C2-substituted imidazole push–pull systems with extended and varied π-conjugated pathway 15a – g [ 16 – 17 47 ]. The π-linker comprises 1,4-phenylene (C 6 H 4 ), thiophen-2,5-diyl (C 4 H 2 S), ethenylene, and azo subunits ( Fig.…”

“… General structure of 4,5-bis(4-aminophenyl)imidazole-derived chromophores 15a – g with various π-linkers [ 16 – 17 47 ]. …”

Synthesis and Characterization of L-Arginine H3PO4 Nano-Crystals with Non-Linear Optical Properties.

“…Ultraviolet-Visible, show a highly transparent window to 275-1100 nm. Infrared, IR spectra confirm the chemical constituents and functional groups are present in the crystals [1] and AFM technique confirm their sizes around 20 nm. A discussion about the atomic and electronic structure and its simulation are presented here.…”