4041-19-4Relevant articles and documents
Impact of strength and size of donors on the optoelectronic properties of D-π-A sensitizers
Sivanadanam,Ganesan,Gao, Peng,Nazeeruddin,Emeline, Alexei,Bahnemann, Detlef,Rajalingam
, p. 37347 - 37361 (2016)
A series of carbazole based sensitizers with either phenyl based donors (TBC, TMC, OMC, PC, TBR, TMR, OMR and PR) or aryl amine based donors (OMNC, CNC and HNC) as well as one without a donor group (CC) have been synthesized to understand the influence of the strength of the donor moiety on the optical, electrochemical and photovoltaic properties. Two different acceptor moieties such as cyano acrylic acid and rhodanine acetic acid were introduced and evaluated. Different substituents on the phenyl group have a significant impact on the light harvesting ability of the sensitizers. Among phenyl based donors, anisole based carbazole (OMC) shows the highest short circuit current (JSC) of 4.96 mA cm-2 with overall power conversion efficiency (PCE) of 2.69%. In the case of the sensitizers with aryl amine based donors, the increasing bulkiness of the donor group lead to increasing open circuit potential. Transient photocurrent and photovoltage measurements signify the importance of a bulky donor fragment in determining the open circuit potential of the dyes. Sensitizers with hexyloxy substituted phenyl amine as the donor group shows a JSC of 6.84 mA cm-2 with PCE of 3.33%. The overall investigation provides vital information about the influence of donor groups on the optoelectronic properties of the sensitizers for its photovoltaic applications.
Origin of the color of π-conjugated polymers: Poly(N-n-octyl-3- carbazoyl)acetylene prepared with a [Rh(norbornadiene)Cl]2 catalyst
Tabata, Masayoshi,Fukushima, Takashi,Sadahiro, Yoshikazu
, p. 4342 - 4350 (2004)
[Rh(NBD)CL]2 catalyst was used to prepare poly(N-n-octyl-3- carbazoyl)acetylene, p(NOCzA) in the presence of various solvents at room temperature to selectively produce the corresponding cis-transoid polymer in high yields. The poly(NOCzA)s obtained were characterized in detail using analytical methods. The yellow or orange color of the polymers was ascribed to formation of the columnar as the π-conjugated self assembly whose content could also be decreased with compression associated with a red shift of the absorption maximum in the UV vis spectrum. The correlation between the absorption maximum in the conjugated polymer with the ionization potential was also described.
Developing new hybrid scaffold for urease inhibition based on carbazole-chalcone conjugates: Synthesis, assessment of therapeutic potential and computational docking analysis
Kazmi, Madiha,Khan, Imtiaz,Khan, Ajmal,Halim, Sobia Ahsan,Saeed, Aamer,Mehsud, Saifullah,Al-Harrasi, Ahmed,Ibrar, Aliya
, (2019)
Although a diverse range of chemical entities offering striking therapeutic potential against urease enzyme has been reported, the key challenges (toxicity and safety) associated with these inhibitors create a large unmet medical need to unveil new, poten
A series of V-shaped small molecule non-fullerene electron acceptors for efficient bulk-heterojunction devices
Rao, Pedada S.,More, Vishal G.,Jangale, Asha D.,Bhosale, Sheshanath V.,Bhosale, Rajesh S.,Puyad, Avinash L.,Chen, Jing-Yu,Li, Jing-Liang,Bhosale, Sidhanath V.,Gupta, Akhil,Sharma, Ganesh D.
, (2019)
Two simple semiconducting acceptor-acceptor1-donor-acceptor (A-A1-D-A) modular, small molecule non-fullerene electron acceptors, 2-(4-(7-hexadecyl-1,3,6,8-tetraoxo-3,6,7,8-tetrahydrobenzo[lmn][3,8]phenanthrolin-2(1H)-yl)phenyl)-3-(6-
A two-photon fluorescent lipid raft probe derived from dicyanostilbene and similar to cholesterol’s structure
Huang, Chibao,Yang, Yuzhu,Li, Youfeng,Lv, Guoling
, p. 1223 - 1230 (2021/08/26)
Lipid raft is a microdomain being rich in cholesterol and sphingolipid and closely related to neurodegenerative diseases such as Alzheimer’s disease and prion disease. Hence the study on the physiological mechanism of lipid raft is helpful to reveal its biological role and its correlations with diseases. Two-photon fluorescence probe for lipid raft is a sharp tool to achieve this goal. A dicyanocarbazolylstilbene-derived two-photon fluorescence probe for lipid raft (DLR) was developed. Both DLR and lipid raft belong to D-π-A (donor-π-acceptor; π: C = C) type rigid planar molecule, and contain four fused carbon rings (one five-membered ring and three six-membered ring), and bear a long carbon chain (C8H17). The excellent comparability between the rigid plane of the probe molecule and the rigid lipid raft could significantly enhance the specific affinity to lipid rafts. DLR’s maximum emission wavelength increased with medium polarity while its fluorescence intensity (FI) augmented with viscosity, and FI in DPPC (dipalmitoylphosphatidylcholine) was 20 times higher than that in DOPC (dioleoylphosphatidylcholine). DLR’s fluorescence lifetime in DPPC was more than 2.2 times longer than that in DOPC. These indicate that DLR can distinguish DPPC from DOPC. Φδs of DLR in DPPC and DOPC were 1350 GM and 67 GM, respectively. DLR can image lipid raft distribution in cells and tissues. Graphic abstract: [Figure not available: see fulltext.]
Molecular engineering of pyrene carbazole dyes with a single bond and double bond as the mode of linkage
Unny, Divya,Kandregula, Ganapathi Rao,Sivanadanam, Jagadeeswari,Ramanujam, Kothandaraman
supporting information, p. 16511 - 16525 (2020/10/14)
Both carbazole and pyrene are electron-rich aromatic systems and are expected to be potential donors when used in a push-pull dye architecture in the field of DSSC technology. Herein, two novel pyrene-carbazole dyes bearing single bond (PC1) and double bond (PC2) linkers and cyano-acrylic acid as an acceptor were synthesized. The dye with a double bond spacer (PC2) in the presence of CDCA achieved an improved power conversion efficiency of 6.30% with a short circuit current of 11.59 mA cm-2, open circuit potential (VOC) of 0.80 V, and a fill factor of 0.68 under standard global AM 1.5G solar conditions. Cyclic voltammetry and density functional theory studies indicate that the incorporation of two donors improved the ease of oxidation of the dyes, which resulted in a high VOC. Despite having a rigid single bond, the charge transfer of the PC1 dye is found to be poor, which affected the photovoltaic performance. The dihedral angle measured at each joint of the optimized dye indicated that PC2 exhibits excellent intramolecular charge transfer due to the near planarity in the structure. Besides, the high electron lifetime in the excited state of PC2 makes it the best performer among the three dyes studied.
