Analysis of crystallographic structures of Ni(ii) complexes of α-amino acid Schiff bases: elucidation of the substituent effect on stereochemical preferences

2017 ◽  
Vol 46 (13) ◽  
pp. 4191-4198 ◽  
Author(s):  
Yong Nian ◽  
Jiang Wang ◽  
Hiroki Moriwaki ◽  
Vadim A. Soloshonok ◽  
Hong Liu
Keyword(s):  
Amino Acid ◽  
Schiff Bases ◽  
Substituent Effect ◽  
Aromatic Interactions ◽  
Crystallographic Structures

This work disclosed the significance of a parallel displaced type of aromatic interactions between o-amino-benzophenone and N-benzyl rings in Ni(ii) complexes.

Platinum(II) complexes of reduced amino acid ester Schiff bases: synthesis, characterization, and antitumor activity

2012 ◽  
Vol 40 (1) ◽  
pp. 413-424 ◽  
Author(s):  
Li-Jun Li ◽  
Cheng Wang ◽  
Yu Qiao ◽  
Xiao-Yan Yang ◽  
Xing-Xing Hua ◽  
...  
Keyword(s):  
Amino Acid ◽  
Antitumor Activity ◽  
Schiff Bases ◽  
Acid Ester ◽  
Amino Acid Ester

Synthesis, characterization and cytotoxicity of platinum(II) complexes containing reduced amino acid ester Schiff bases

2016 ◽  
Vol 31 (6) ◽  
pp. e3689 ◽  
Author(s):  
Qin-Qin Yan ◽  
Zhen Yuan ◽  
Guo-Jun Liu ◽  
Zheng-Hua Lv ◽  
Bin Fu ◽  
...  
Keyword(s):  
Amino Acid ◽  
Schiff Bases ◽  
Acid Ester ◽  
Amino Acid Ester

scholarly journals Photoinduced Decarboxylation-dependent Transamination of Pyridoxal 5′-Phosphate-α-Amino Acid Schiff Bases

1980 ◽  
Vol 44 (10) ◽  
pp. 2499-2500
Author(s):  
Yoshiaki Kurauchi ◽  
Kazuya Ohga ◽  
Mitsuaki Moriguchi ◽  
Shigeru Morita
Keyword(s):  
Amino Acid ◽  
Schiff Bases

Spectroscopic, antiproliferative and antiradical properties of Cu(II), Ni(II), and Zn(II) complexes with amino acid based Schiff bases

2013 ◽  
Vol 23 (5) ◽  
pp. 2476-2485 ◽  
Author(s):  
Zuhal Karagoz Genc ◽  
Sibel Selcuk ◽  
Suleyman Sandal ◽  
Naki Colak ◽  
Serhat Keser ◽  
...  
Keyword(s):  
Amino Acid ◽  
Schiff Bases ◽  
Antiradical Properties

A Study of Substituent Effect on the Oxidative Strengths of N-Chloroarenesulphonamides: Kinetics of Oxidation of Leucine and Isoleucine in Aqueous Acid Medium

2004 ◽  
Vol 59 (1) ◽  
pp. 63-72 ◽  
Author(s):  
Mahesha Shetty ◽  
B. Thimme Gowda
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Ionic Strength ◽  
Acid Medium ◽  
Benzene Ring ◽  
Thermodynamic Data ◽  
Substituent Effect ◽  
Kinetics Of Oxidation ◽  
Aqueous Acid ◽  
Kinetics Of

Abstract To study the variation of oxidative strengths of N-chloro-arenesulphonamides with substitution in the benzene ring, six mono- and five di-substituted N-chloro-arenesulphonamides are employed as oxidants for studying the kinetics of oxidation of two neutral amino acids, L-leucine and Lisoleucine in aqueous acid medium. The N-chloro-arenesulphonamides studied are of the constitution: ArSO2NaNCl·H2O (where Ar = C6H5, 4-CH3C6H4, 4-C2H5C6H4, 4-FC6H4, 4-ClC6H4, 4-BrC6H4, 2,3-(CH3)2C6H3, 2,4-(CH3)2C6H3, 2-CH3-4-ClC6H3, 2,4-Cl2C6H3, and 3,4-Cl2C6H3). The reactions show second order kinetics in [oxidant], fractional order in [amino acid] and inverse dependence on [H+]. Addition of the reduced product of the oxidants or variation in ionic strength of the medium has no significant effect on the rates of oxidations. A two-pathway mechanism is considered to explain the experimental results. Effective oxidizing species of the oxidants is Cl+ in different forms. Therefore the oxidising strengths of N-chloro-arenesulphonamides depend on the ease with which Cl+ is released from them. The study reveals that the introduction of substituent in the benzene ring of the oxidant affects both the kinetic and thermodynamic data for the oxidations The electron releasing groups such as CH3 generally inhibit the rates, while electron-withdrawing groups such as Cl enhance this ability, as the electron withdrawing groups ease the release of Cl+ from the reagents and hence increase the oxidising strengths. The on Ea and logA and validity of the Hammett and isokinetic relationships for the oxidations are also analysed.

Substituent effect on electrophoretic mobility for a series of poly(N-acryloyl-amino acid)s

2010 ◽  
Vol 1217 (17) ◽  
pp. 2990-2992 ◽  
Author(s):  
Akihito Hashidzume ◽  
Takefumi Kawata ◽  
Atsushi Tanaka ◽  
Yukiko Takabayashi ◽  
Takahiro Sato
Keyword(s):  
Amino Acid ◽  
Electrophoretic Mobility ◽  
Substituent Effect
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