The influence of substituent effects on spectroscopic properties examined on benzylidene aniline-type imines.
01 Sep 2012-Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy (Elsevier)-Vol. 95, pp 18-24
TL;DR: Six selected benzylidene aniline-type prochiral imines were characterised by means of ATR-IR, UV-vis and Raman spectroscopy and the effect of inter- and intramolecular hydrogen bond formation was demonstrated by changes of characteristic bands in the spectra.
About: This article is published in Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy.The article was published on 2012-09-01. It has received 14 citations till now. The article focuses on the topics: Raman spectroscopy & Double bond.
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TL;DR: In this paper, a review highlights the excited state characteristics of imines and processes that govern their photochemical and photophysical properties, and examines the pathways for deactivation and types of photochemical reactions that originate from excited imines.
Abstract: This review highlights the excited state characteristics of imines and processes that govern their photochemical and photophysical properties. This review examines the pathways for deactivation and types of photochemical reactions that originate from excited imines. This review also features recent strategies that are developed to circumvent the fundamental issues that have plagued the development of the aza Paterno–Buchi reaction.
34 citations
TL;DR: A series of pyrrolidene imines bearing functionalized aryl or naphthyl moieties was synthesized and their photochromic properties studied by UV spectroscopy as discussed by the authors.
Abstract: a b s t r a c t A series of novel pyrrolidene imines bearing functionalized aryl or naphthyl moieties was synthesized and their photochromic properties studied by UV spectroscopy. UV irradiation of these heterocyclic Schiff bases at room temperature promotes the trans-cis photoisomerization of the C N double bond with for- mation of a variable amount of the cis-isomer that, in the absence of light, returns thermally to the original form in few seconds. The thermal cis-trans re-isomerization of these molecular switches is much more slower than for the common benzylidene aniline-type imines, allowing the observation of the pho- tochromic phenomena at room temperature. Strong electron-donor substituents in the para-position of the aniline part of the molecule decreases even more the kinetics of the thermal cis-trans re-isomerization leading to a manifest change in the UV spectrum. © 2013 Elsevier B.V. All rights reserved.
28 citations
TL;DR: This paper describes the synthesis, spectroscopic characterization and quantum mechanical calculations of three azo-azomethine dyes, synthesized via condensation reaction between 4-(dimethylamino)benzaldehyde and three different 4-aminobenzene azo dyes.
27 citations
TL;DR: In this article, Nisin was bonded on glass microstructural surfaces, using dopamine as a coupling agent, to prepare a physical-biological synergistic antifouling coating.
18 citations
TL;DR: In this article, the first examples of thioether-linked benzylideneaniline-based liquid crystal dimer homologues were synthesized and characterized, and they formed twist-bend nematic phases below the temperatures of conventional nematic (N) phases upon cooling.
8 citations
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TL;DR: This paper could serve as a general literature citation when one or more of the open-source SH ELX programs (and the Bruker AXS version SHELXTL) are employed in the course of a crystal-structure determination.
Abstract: An account is given of the development of the SHELX system of computer programs from SHELX-76 to the present day. In addition to identifying useful innovations that have come into general use through their implementation in SHELX, a critical analysis is presented of the less-successful features, missed opportunities and desirable improvements for future releases of the software. An attempt is made to understand how a program originally designed for photographic intensity data, punched cards and computers over 10000 times slower than an average modern personal computer has managed to survive for so long. SHELXL is the most widely used program for small-molecule refinement and SHELXS and SHELXD are often employed for structure solution despite the availability of objectively superior programs. SHELXL also finds a niche for the refinement of macromolecules against high-resolution or twinned data; SHELXPRO acts as an interface for macromolecular applications. SHELXC, SHELXD and SHELXE are proving useful for the experimental phasing of macromolecules, especially because they are fast and robust and so are often employed in pipelines for high-throughput phasing. This paper could serve as a general literature citation when one or more of the open-source SHELX programs (and the Bruker AXS version SHELXTL) are employed in the course of a crystal-structure determination.
81,116 citations
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TL;DR: This review documents the structural and mechanistic features that contribute to high enantioselectivity in hydrogen-bond-mediated catalytic processes in small-molecule, synthetic catalyst systems.
Abstract: Hydrogen bonding is responsible for the structure of much of the world around us. The unusual and complex properties of bulk water, the ability of proteins to fold into stable three-dimensional structures, the fidelity of DNA base pairing, and the binding of ligands to receptors are among the manifestations of this ubiquitous noncovalent interaction. In addition to its primacy as a structural determinant, hydrogen bonding plays a crucial functional role in catalysis. Hydrogen bonding to an electrophile serves to decrease the electron density of this species, activating it toward nucleophilic attack. This principle is employed frequently by Nature's catalysts, enzymes, for the acceleration of a wide range of chemical processes. Recently, organic chemists have begun to appreciate the tremendous potential offered by hydrogen bonding as a mechanism for electrophile activation in small-molecule, synthetic catalyst systems. In particular, chiral hydrogen-bond donors have emerged as a broadly applicable class of catalysts for enantioselective synthesis. This review documents these advances, emphasizing the structural and mechanistic features that contribute to high enantioselectivity in hydrogen-bond-mediated catalytic processes.
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TL;DR: In this article, the authors classified the catalytic cycles for the H2-hydrogenation (H) and transfer hydrogenation (T) of CO and cN bonds catalyzed by over 100 ruthenium hydride complexes in organic and aqueous media.
1,151 citations
TL;DR: A number of chiral acid catalysts have been developed recently as discussed by the authors, with a focus being placed on thiourea, TADDOL, and phosphoric acids, which are rapidly growing areas in organocatalysis.
Abstract: Hydrogen bond catalysis and Bronsted acid catalysis are rapidly growing areas in organocatalysis. A number of chiral acid catalysts has been developed recently. Recent progress in the chiral Bronsted acid catalysis has been reviewed with a focus being placed on thiourea, TADDOL, and phosphoric acids. 1 Introduction 2 Hydrogen Bond Catalysis 2.1 Monofunctional Thiourea Catalysts 2.2 Bifunctional Thiourea Catalysts 2.3 TADDOL Derivatives 2.4 BINOL Derivatives 3 Bronsted Acid Catalysis 3.1 Ammonium Salts 3.2 Phosphoric Acids 4 Conclusion
773 citations