Direct Evidence for Secondary Interactions in Planar and Nonplanar Aromatic π-Conjugates and Their Photophysical Characteristics in Solid-State Assemblies
摘要:
Direct evidence for non-covalent secondary interactions in planar and nonplanar aromatic pi-conjugates and their solid-state assemblies is established. A series of horizontally, vertically, and radially expanded oligo(phenylenevinylene)s (H-OPVs, V-OPVs, and R-OPVs, respectively) were designed with a fixed pi-core and variable alkyl chain lengths on the periphery. Single-crystal structures of the OPVs were resolved to trace the secondary interactions that direct the solid-state self-organization and molecular packing of the chromophores. The H-OPVs were found to be planar, and they did not show any secondary interactions in the crystal lattices. The V-OPVs and R-OPVs were found to be nonplanar and to exhibit multiple CH/pi hydrogen-bonding interactions among aryl hydrogen donors and acceptors. The enthalpies of the melting and crystallization transitions revealed that the planar H-OPVs are highly crystalline compared with the nonplanar R-OPVs and V-OPVs. Polarized light microscopy studies revealed the formation of one-dimensional nematic mesophases in H-OPVs. The absolute solid-state photoluminescence quantum yields (PLQYs) of the OPVs were determined using an integrating sphere setup. The highly packed H-OPVs showed low PLQYs compared with those of the weakly packed V-OPVs and R-OPVs. Time-resolved fluorescence decay measurements revealed that the excited-state decay dynamics of highly packed H-OPVs was much faster with respect to their low PLQYs. The decay profiles were found to be relatively slow (with higher life time (tau)) in the V-OPVs and R-OPVs. A field-effect transistor (FET) device was constructed for an OPV sample that showed a hole carrier mobility in the range of 10(-5) cm(2) V-1 s(-1). The present investigation thus provides a new opportunity to trace the role of secondary interactions on pi-conjugated mesophase self-assemblies and their solid-state emission and FET devices, more specifically based on OPV chromophores.
Organic−inorganic hybrids have been fabricated through mild Diels−Alder cross-linking between maleimide bearing oligo(p-phenylenevinylene) (OPV) and furan functionalized gold nanoparticles with diameter smaller than 2 nm. The OPV ligands afford strong reaction ability toward furan group due to their maleimide moieties. These small gold nanoparticles form close-packed homogeneous hybrids with well-defined
Role of synergistic π–π stacking and X–H⋯Cl (X = C, N, O) H-bonding interactions in gelation and gel phase crystallization
作者:Subham Bhattacharjee、Santanu Bhattacharya
DOI:10.1039/c5cc00930h
日期:——
Gel phase crystallization in a transparent gel via synergistic non-covalent interactions has been reported along with various remarkable features.
在透明凝胶中通过协同非共价相互作用发生的凝胶相结晶已经报道,并伴随着各种显著特征。
Influence of heteroaryl group on electrochemical and spectroscopic properties of conjugated polymers
作者:P. Data、M. Lapkowski、R. Motyka、J. Suwinski
DOI:10.1016/j.electacta.2012.08.020
日期:2012.11
During our search for novelconjugated compounds, novel monomers and their polymers with selenophene and tellurophene group were synthesized and characterized. Conjugated poly(p-phenylenevinylenes)s (PPV) derivatives attracted a large attention due to their photolouminescence properties. The stereocontrolled synthesis of 1,4-bis(2-(heteroar-2-yl) ethenyl)benzenes and 1,4-bis(heteroar-2-yl)benzenes
Orotic acid as a useful supramolecular synthon for the fabrication of an OPV based hydrogel: stoichiometry dependent injectable behavior
作者:Subham Bhattacharjee、Santanu Bhattacharya
DOI:10.1039/c5cc01002k
日期:——
A multi-stimuli responsive, vesicular, two-component, injectable hydrogel has been reported.
一种多刺激响应、囊泡状、双组分、可注射的水凝胶已被报道。
Solid Supramolecular Architecture of a Perylene Diimide Derivative for Fluorescent Enhancement
作者:Yanwen Yu、Qinghua Shi、Yongjun Li、Taifeng Liu、Liang Zhang、Zhigang Shuai、Yuliang Li
DOI:10.1002/asia.201200659
日期:2012.12
A new p‐phenylenevinylene‐linked perylenediimide has been synthesized and self‐assembled for the formation of zero‐dimensional molecular aggregate structures of nanospheres and vesicles through solvent tuning. The solid‐state optical properties induced by a special wavelength laser were studied and the results indicated excellent fluorescentenhancement properties. The emission intensity of these