Donor Acceptor System
Mostrando 1-12 de 92 artigos, teses e dissertações.
-
1. STUDY OF SPECTROPHOTOMETRIC CHARACTERISTICS OF THE CHARGE TRANSFER COMPLEX OF TAURINE DRUG WITH 7,7,8,8-TETRACYANOQUINODIMETHANE
A new spectrophotometric method was developed for the determination of taurine using 7,7,8,8-tetracyanoquinodimethane (TCNQ). The method was based on the formation of charge transfer (CT) complex of this drug as n-electron donor with the π-acceptor TCNQ. TCNQ was found to react with taurine to produce a kind of yellow complex. The spectrum obtained for taur
Quím. Nova. Publicado em: 2020-09
-
2. UNRAVELING THE SOLVATOCHROMISM OF A TRIARYLMETHANE DYE BY RESONANCE RAMAN SPECTROSCOPY
The effect of the solvent on the electronic properties of the triarylmethane dye rosolic acid (RA) is investigated by means of UV-VIS and resonance Raman (RR) spectroscopies. The comparison of the solvatochromic behavior of both neutral and dianionic species of RA in acetonitrile, dimethylsulfoxide, and methanol illustrates the effect of polarity and hydroge
Quím. Nova. Publicado em: 05/12/2019
-
3. Estrutura eletronica e polarizabilidades de betainas
This thesis is dedicated to a theoretical study of the electronic structure and optical properties of betaine molecules carried at the semiempirical and ab initio levels. The charge distribution, the dipole moment and the linear (a) and first nonlinear (Ã) polarizabilities of a total of 66 betaine molecules belonging to 6 different families were calculated.
Publicado em: 2007
-
4. Retificadores moleculares: transferÃncia autoconsistente de elÃtrons em sistemas doadoraceitador
AtravÃs de cÃlculos ab initio Hartree-Fock e com base na teoria do funcional densidade, esta dissertaÃÃo consiste em um estudo teÃrico sobre os efeitos do campo elÃtrico na estrutura eletrÃnica de um sistema molecular do tipo doador - ponte saturada - aceitador, como parte de uma avaliaÃÃo mais completa de molÃculas que possam servir como dispositi
Publicado em: 2007
-
5. Polymeric nanocomposites containing azodyes, phthalocyanines and luminescent polymers / Compósitos poliméricos nanoestruturados de azocorantes,ftalocianinas e polímeros luminescentes
This thesis describes the fabrication and possible applications of layer-by-Iayer (LBL) nanostructured films for three distinct systems comprising i) azopolymers and azodyes, ii) organometallic molecules (phthalocyanines) and iii) luminescent polymers and azodyes. Optically induced birefringence and surface relief gratings (SRGs) were studied in the azobenze
Publicado em: 2003
-
6. Hiperpolarizabilidades Semi-EmpÃricas de Sistemas OrgÃnicos Doador-Receptor
The research on new nonlinear materials finds in Quantum Chemistry the possibility of designing organic molecules with optimized performance. It is performed by matching adequate components of structure, that is, a bridge (B) and an efficient donor(D)/acceptor(A) pair. Hence, some classes of D/A organic molecules were designed and theoretically observed to h
Publicado em: 2001
-
7. Condutância molecular e biomolecular
The concept of molecular conductance is discussed in terms of the propagation of an electronic interaction, between electron donor and acceptor groups, through the bonds of a molecular structure where these groups are embedded. The electronic interaction propagation is described by a Green's function matrix element, in a donor-bridge-acceptor molecular syste
Química Nova. Publicado em: 2000-06
-
8. Evaluation of the Distribution of Distances Between Energy Donors and Acceptors by Fluorescence Decay
When transfer of electronic excitation energy occurs between a donor-acceptor pair by the Förster mechanism, the decay of fluorescence of the donor follows first-order kinetics, with a rate constant that depends on the distance from donor to acceptor. In a system that contains donor-acceptor pairs of different separations, the fluorescence decay of the dono
-
9. Collisional energy transfer and quenching of electronic excitation
The purpose of this paper has been to explore in a preliminary way the nature and mechanism of collisional energy transfer and quenching of electronic excitation. For this purpose, the Born approximation has been used, and the triplet-triplet and singlet-singlet transfer, and the triplet-triplet and singlet-singlet quenching have been studied. It has been sh
-
10. Concerted integration of linear retroviral DNA by the avian sarcoma virus integrase in vitro: dependence on both long terminal repeat termini.
We have reconstituted integration reactions in vitro with specially designed donor DNAs, a supercoiled plasmid acceptor, purified bacterium-derived Rous sarcoma virus integrase (IN), and a host cell DNA-bending protein, HMG1. The duplex donor DNAs are approximately 300 deoxynucleotides in length and contain only 15 bp of the RSV U3 and U5 termini at the resp
-
11. Amino acid transport in membrane vesicles of obligately anaerobic Veillonella alcalescens.
Membrane vesicles of Veillonella alcalescens, grown in the presence of L-lactate and KNO-3, actively transport amino acids under anaerobic conditions in the presence of several electron donors and the electron acceptor nitrate. The highest initial rates of uptake are obtained with L-lactate, followed by reduced nicotinamide adenine dinucleotide, glycerol-1-p
-
12. Effects of Limiting Homology at the Site of Intermolecular Recombinogenic Template Switching during Moloney Murine Leukemia Virus Replication
A Moloney murine leukemia virus-based single-replication-cycle assay was developed to study the effects of limiting the extent of template and primer strand complementarity on recombinogenic template switching. This system mimicked forced copy choice recombination in which nascent DNA transfers from the end of a donor template to an acceptor position on the
American Society for Microbiology.