Twisted π-Electron System Electrooptic Chromophores. Structural and Electronic Consequences of Relaxing Twist-Inducing Nonbonded Repulsions†
نویسندگان
چکیده
Yiliang Wang,‡ David L. Frattarelli,‡ Antonio Facchetti,‡ Elena Cariati,*,§ Elisa Tordin,§ Renato Ugo,§ Cristiano Zuccaccia,| Alceo Macchioni,*,| Staci L. Wegener,‡ Charlotte L. Stern,‡ Mark A. Ratner,*,‡ and Tobin J. Marks*,‡ Department of Chemistry and the Materials Research Center, Northwestern UniVersity, 2145 Sheridan Road, EVanston, Illinois 60208-3113, Dipartimento di Chimica Inorganica Metallorganica e Analitica, UniVersità di Milano, Via Venezian 21, I-20133 Milano, Italy, and Dipartimento di Chimica, UniVersità di Perugia, Via Elce di Sotto 8, I-06123 Perugia, Italy
منابع مشابه
NanoARPES of twisted bilayer graphene on SiC: absence of velocity renormalization for small angles
The structural and electronic properties of twisted bilayer graphene (TBG) on SiC(000) grown by Si flux-assisted molecular beam epitaxy were investigated using scanning tunneling microscopy (STM) and angle-resolved photoelectron spectroscopy with nanometric spatial resolution. STM images revealed a wide distribution of twist angles between the two graphene layers. The electronic structure recor...
متن کاملUltralarge hyperpolarizability twisted pi-electron system electro-optic chromophores: synthesis, solid-state and solution-phase structural characteristics, electronic structures, linear and nonlinear optical properties, and computational studies.
This contribution details the synthesis and chemical/physical characterization of a series of unconventional twisted pi-electron system electro-optic (EO) chromophores. Crystallographic analysis of these chromophores reveals large ring-ring dihedral twist angles (80-89 degrees) and a highly charge-separated zwitterionic structure dominating the ground state. NOE NMR measurements of the twist an...
متن کاملExceptional Molecular Hyperpolarizabilities in Twisted [pi]-Electron System ChromophoresSupported by DARPA/ONR (SP01P7001R-A1/N00014-00-C), the NSF-Europe Program (DMR-0353831), and MIUR(PRIN 2004-2005). We thank Dr. S. Keinan and Prof. M. Ratner for computational collaboration
Molecule-based electrooptic (EO) materials are of intense research interest for understanding how light interacts with matter and for applications in photonic technologies such as high-speed optical communications, integrated optics, and optical data processing and storage. In such materials, the second-order susceptibility tensor governing EO response (r33), is governed both by the net polar m...
متن کاملEffect of Twisted Tape Baffles on Pressure Drop, Fluctuation and Expansion Ratios in gas - Solid Fluidized Bed
In the present work an attempt has been made to study the effect of the twisted tapes as bed internals, on the performance of the gas-solid fluidized beds. Experimental investigation has been carried out in cylindrical column with and without twisted tapes. Twelve numbers of twisted tapes of three different widths with four values of the twist ratios for each width were studied at different...
متن کاملارزیابی عملکرد نوارهای پیچیده شده درافزایش انتقال حرارت چگالشی و تأثیر آن برمیزان افت فشار
In this research, heat transfer enhancement and simultaneous effect of that on pressure drop inside condensers with twisted tape inserts are investigated. A refrigeration system is designed for attaining to maximum level of heat transfer with minimum pressure drop. The test condenser is a double pipe heat transformer with inner and outer diameter of 10.7mm and 12.7mm for internal pipe, respecti...
متن کامل