Results 41 to 50 of about 57,191 (159)

Quantum Chemical Design Guidelines for Absorption and Emission Color Tuning of fac-Ir(ppy)3 Complexes

Molecules, 2018
The fac-Ir(ppy)3 complex, where ppy denotes 2-phenylpyridine, is one of the well-known luminescent metal complexes having a high quantum yield. However, there have been no specific molecular design guidelines for color tuning.
Yoshiki Natori, Yasutaka Kitagawa, Shogo Aoki, Rena Teramoto, Hayato Tada, Iori Era, Masayoshi Nakano   +6 more
doaj   +1 more source

New description of the substituent effect on electronic spectra by means of substituent constants

Journal of Molecular Structure: THEOCHEM, 1991
著者らは近年,電子スペクトルに対する置換基効果を置換基定数で記述する新しい方法を研究してきた。電子スペクトルで測定される一重項あるいは三重項遷移エネルギー(1.3Euv)は, Swain らの FR 置換基定数あるいは湯川らの置換基定数 (σi ,σπ+,σπ-)を用いて, 1.3EUV=aF+bR+C, 1,3EUV=ασi+βσπ++γσπ-+Cと記述された。そして,これらは共役系の n-π* 吸収帯を初め,共役系および脂肪族系の n-π* 吸収帯,分子内電荷移動吸収帯,分子化合物の分子間電荷移動吸収帯およびそれら錯体形成による成分化合物自身の吸収帯などに対する置換基効果に適用できる一般式であることを明らかにした。さらに,ベンゼン置換体の吸収帯を用いて,これらの式の適用限界を議論した ...
Bunji UNO, Tanekazu KUBOTA
openaire   +2 more sources

Regioselectivity of the Claisen Rearrangement of Meta- and Para-Substituted Allyl Aryl Ethers

Reactions
The regioselectivity of the Claisen rearrangement with different meta-substituted and meta- and para-substituted allyl phenyl ethers was investigated.
William Thomas Möller, Svava Dögg Hreinsdóttir, Luis Antonio Arana, Benjamín Ragnar Sveinbjörnsson   +3 more
doaj   +1 more source

Substituent Effect versus Aromaticity─A Curious Case of Fulvene Derivatives. [PDF]

J Org Chem, 2023
Wieczorkiewicz PA, Zborowski KK, Krygowski TM, Szatylowicz H.   +3 more
europepmc   +1 more source

Dual-Emissive Monoruthenium Complexes of N(CH₃)-Bridged Ligand: Synthesis, Characterization, and Substituent Effect. [PDF]

Materials (Basel), 2023
Wu SH, Zhang Z, Zheng RH, Yang R, Wang L, Shao JY, Gong ZL, Zhong YW.   +7 more
europepmc   +1 more source

Positive Encapsulation‐Induced Emission Control of Aggregation‐Induced Emission‐Active Anthracenes within Micellar Capsules in Water

Aggregate
Whereas aggregation‐induced emission (AIE) is a useful tool to develop photofunctional host systems, its guest usability has been largely unexplored within well‐defined host compounds so far, mainly owing to the absence of suitable cavities.
Ryuki Kitaura, Yuta Kikuchi, Lorenzo Catti, Kensei Konishi, Gen‐ichi Konishi, Michito Yoshizawa   +5 more
doaj   +1 more source

Synthesis, structure and solvatochromic properties of some novel 5-arylazo-6-hydroxy-4-phenyl-3-cyano-2-pyridone dyes

Chemistry Central Journal, 2012
Background A series of some novel arylazo pyridone dyes was synthesized from the corresponding diazonium salt and 6-hydroxy-4-phenyl-3-cyano-2-pyridone using a classical reaction for the synthesis of the azo compounds.
Alimmari Adel, Mijin Dušan, Vukićević Radovan, Božić Bojan, Valentić Nataša, Vitnik Vesna, Vitnik Željko, Ušćumlić Gordana   +7 more
doaj   +1 more source

Synthesis, properties and colour assessment of some new 5-(3- and 4-substituted phenylazo)-4,6-dimethyl-3-cyano-2-pyridones [PDF]

Journal of the Serbian Chemical Society, 2006
A series of 5-(3- and 4-substituted phenylazo)-4,6-dimethyl-3-cyano-2-pyridones were synthesized, starting from acetylacetone and arenediazonium salt, followed by condensation with cyanoacetamide using a modified literature procedure.
DUSAN MIJIN, GORDANA USCUMLIC, NADA PERISIC-JANJIC, IVAN TRKULJA, MAJA RADETIC, PETAR JOVANCIC   +5 more
doaj  

Nucleophilic Substitution on 2-Monosubstituted Quinoxalines Giving 2,3-Disubstituted Quinoxalines: Investigating the Effect of the 2-Substituent

Molecules, 2016
An investigation on the effect of substituent at the 2-position of mono-substituted quinoxalines in the synthesis of di-substituted quinoxaline derivatives via nucleophilic substitution reactions, is reported.
Ndumiso Thamsanqa Ndlovu, Winston Nxumalo   +1 more
doaj   +1 more source

Substituent Effect in the Cation Radicals of Monosubstituted Benzenes. [PDF]

Int J Mol Sci, 2021
Dobrowolski JC, Dudek WM, Karpińska G, Baraniak A.   +3 more
europepmc   +1 more source