Four organic dyes
based on indolo[3,2,1-jk]carbazole (IC-1, IC-2,
IC-3, and IC-4) with different π-bridges (benzene ring and thiophene
ring) are used for dye-sensitized solar cells (DSSCs) to investigate
the effect of π-bridge on their photovoltaic performance. The
introduction of thiophene ring as π-bridge (the dye IC-2) greatly
improves the cell performance compared to benzene ring. The increasing
conjugation length of the molecules decreases the performance of DSSCs.
The best performance of DSSC based on IC-2 is obtained with a V
oc of 0.66 V and a conversion efficiency of
3.68%. The poor performance of DSSCs based on IC-1 and IC-3 which
contains only benzene ring as the π-bridge can be attributed
to poor spectral coverage and higher electron charge transfer resistance
as evaluated from EIS studies.
Reaction of (S)-4-carbomethoxy-2-phenyl-2-oxazoline with Pd(OAc) 2 leads to the formation of the ortho-palladated complex (S,S)-di-µ-(acetate)-bis{2-[2-(4-carbomethoxy)oxazolinyl]phenyl-C,N}dipalladium(II) (1). In the presence of water, this complex reacts with methylparathion to produce p-nitrophenol as well as two oxazoline palladium dimethylthiophosphate complexes (2 and 3), which have been observed in solution by 31 P NMR. This reaction is accompanied by racemization of the oxazoline ligand and ultimately produces the dinuclear complex (R,S)-di-µ-(dimethylthiophosphate-S,S)-bis{2-[2-(4-carbomethoxy)oxazolinyl]phenyl-C,N}dipal-ladium(II) (4), which features bridging dimethylthiophosphate ligands. At pH 9-10, complex 1 serves as a precatalyst for the hydrolysis of methylparathion. The reaction rate has a first-order dependence in substrate and palladium catalyst with a second-order rate constant of 726 (( 30) M -1 s -1 at pH 9.0.Supporting Information Available: Kinetic, CD, and X-ray crystallographic data for complexes 1 and 4. This material is available free of charge via the Internet at http://pubs.acs.org.
Synthesis of 5,7-phenylquinoline from the Skraup reaction of m-terphenylamine and glycerol in the presence of acid is reported. Further reaction of 5,7-diphenylquinoline with phenyl lithium prepared in situ led to the formation of 2,5,7-triphenylquinoline. All of the products and their intermediates were characterized and the UV-Vis and photo-luminescence (PL) spectra of m-terphenylamine, 5,7-diphenylquinoline and 2,5,7-triphenylquinoline are also reported.
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