Publication detail

Ferrocene-Donor and 4,5-Dicyanoimidazole-Acceptor Moieties in Charge- Transfer Chromophores with p Linkers Tailored for Second-Order Nonlinear Optics

Year: 2013

Type of publication: článek v odborném periodiku

Name of source: Chemistry - An Asian Journal

Publisher name: Wiley-Blackwell

Page from-to: 465-475

Titles:

Language	Name	Abstract	Keywords
cze	Ferrocen donorní a 4,5-dikyanoimidazol akceptorní části chromoforů s vnitřním přenosem náboje s p-můstkem odladěným pro nelineární optiku druhého druhu	BYla připravena série NLO chromforů na bázi ferrocen donoru a 4,5-dikyanimidazolu, které byly dále studovány pomocí chinoidního charakteru, absorpčních spekter, kde byly pozorovány dva pásy. Elektrochemické vlastnosti byly studovány pomocí CV, RDV. Byly rovněž provedeny DFT kalkulace. Vlastnosti těchto systému jsou ovlivňovány především přítomností olefinické/acetylenické podjednotky, délkou p-systému a prostorovým uspořádáním.	přenos nábojer; donor-akceptorní systém; ferrocen; imidazol; nelineární optika
eng	Ferrocene-Donor and 4,5-Dicyanoimidazole-Acceptor Moieties in Charge- Transfer Chromophores with p Linkers Tailored for Second-Order Nonlinear Optics	A series of new nonlinear optical chromophores (1?15) that were comprised of ferrocene-donor and 4,5-dicyanoimidazole-acceptor moieties and various p linkers of different length were synthesized. Support for the presence of significant DA interactions in these NLO-phores was obtained from the evaluation of the quinoid character of the 1,4-phenylene moieties and their electronic absorption spectra, which featured intense high-energy (HE) bands that were accompanied by less-intense low-energy (LE) bands. The redox behavior of these compounds was investigated by cyclic voltammetry (CV) and by rotating-disc voltammetry (RDV); their electrochemical gaps decreased steadily from 2.64 to 2.09 V. In addition to the experimentally obtained data, DFT calculations of their absorption spectra, HOMO/LUMO levels, and secondorder polarizabilities (b) (2w,w,w) were performed. A structure?property relationship study that was performed by systematically altering the p linker revealed that the intramolecular charge-transfer and nonlinear optical properties of these inorganic?organic hybrid DpA systems (1?15) were primarily affected by: 1) The presence of olefinic/acetylenic subunits; 2) the length of the p linker; and 3) the spatial arrangement (planarity) of the p linker.	charge transfer; donor?acceptor systems; ferrocene; imidazole; nonlinear optics

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