Cooperative effects between triel and halogen bonds in complexes of pyridine derivatives: An opposite effect of the nitrogen oxidation on triel and halogen bonds

2020 ◽  
Vol 121 (2) ◽  
Author(s):  
Ruijng Wang ◽  
Bo Xiao ◽  
Wenzuo Li ◽  
Qingzhong Li
Keyword(s):  
Opposite Effect ◽  
Pyridine Derivatives ◽  
Halogen Bonds ◽  
Cooperative Effects ◽  
Nitrogen Oxidation

scholarly journals Using beryllium bonds to change halogen bonds from traditional to chlorine-shared to ion-pair bonds

2015 ◽  
Vol 17 (3) ◽  
pp. 2259-2267 ◽  
Author(s):  
Ibon Alkorta ◽  
José Elguero ◽  
Otilia Mó ◽  
Manuel Yáñez ◽  
Janet E. Del Bene
Keyword(s):  
Halogen Bond ◽  
Ion Pair ◽  
Ternary Complexes ◽  
Halogen Bonds ◽  
Bond Type ◽  
Cooperative Effects ◽  
Pair Bonds

Dramatic synergistic cooperative effects between Be⋯F beryllium bonds and Cl⋯N halogen bonds in XYBe:FCl:N-base ternary complexes lead to changes in the halogen-bond type from traditional to chlorine-shared to ion-pair bonds.

Modeling cooperative effects in halogen-bonded infinite linear chains

2017 ◽  
Vol 19 (28) ◽  
pp. 18529-18538 ◽  
Author(s):  
Francisco Adasme-Carreño ◽  
Jans Alzate-Morales ◽  
Joel Ireta
Keyword(s):  
Halogen Bonds ◽  
Cooperative Effects ◽  
Linear Chains ◽  
Cyanogen Halides ◽  
Infinite Linear

It is shown that the nature of halogen bonds in cyanogen halides and 4-halopyridines differs, still cooperativity in both systems results from interacting point-dipoles.

Choice of hydrogen bonds or halogen bonds by 2-halogenated 5-morpholinomethylphenyl triazolo[1,5-a]pyridine

CrystEngComm ◽  
2018 ◽  
Vol 20 (22) ◽  
pp. 3006-3010 ◽  
Author(s):  
Changfu Li ◽  
Yingying Chai ◽  
Xinglong Zhou ◽  
Zhen Shen ◽  
Beibei Ma ◽  
...  
Keyword(s):  
Hydrogen Bonds ◽  
Crystal Structures ◽  
Structural Chemistry ◽  
Pyridine Derivatives ◽  
Halogen Bonds

The crystal structures of halogenated 1,2,4-triazolo[1,5-a]pyridine derivatives disclose intriguing structural chemistry features dictated by the formation of either hydrogen bonds (HBs) or halogen bonds (XBs).

Theoretical study on cooperative effects between X⋯N and X⋯Carbene halogen bonds (X = F,Cl,Br and I)

2013 ◽  
Vol 19 (11) ◽  
pp. 4797-4804 ◽  
Author(s):  
Mehdi D. Esrafili ◽  
Fariba Mohammdain-Sabet ◽  
Parvin Esmailpour
Keyword(s):  
Theoretical Study ◽  
Halogen Bonds ◽  
Cooperative Effects

Symmetric bifurcated halogen bonds: substituent and cooperative effects

2016 ◽  
Vol 114 (24) ◽  
pp. 3610-3619 ◽  
Author(s):  
Mehdi D. Esrafili ◽  
Esmail Vessally ◽  
Mohammad Solimannejad
Keyword(s):  
Halogen Bonds ◽  
Cooperative Effects

Can the Academic Self-Concept be Positive and Realistic?

2005 ◽  
Vol 19 (3) ◽  
pp. 129-132 ◽  
Author(s):  
Reimer Kornmann
Keyword(s):  
Academic Performance ◽  
Opposite Effect ◽  
Self Esteem ◽  
Point Of View ◽  
The Other ◽  
Self Concept ◽  
High Ability ◽  
Self Image ◽  
Other Hand

Summary: My comment is basically restricted to the situation in which less-able students find themselves and refers only to literature in German. From this point of view I am basically able to confirm Marsh's results. It must, however, be said that with less-able pupils the opposite effect can be found: Levels of self-esteem in these pupils are raised, at least temporarily, by separate instruction, academic performance however drops; combined instruction, on the other hand, leads to improved academic performance, while levels of self-esteem drop. Apparently, the positive self-image of less-able pupils who receive separate instruction does not bring about the potential enhancement of academic performance one might expect from high-ability pupils receiving separate instruction. To resolve the dilemma, it is proposed that individual progress in learning be accentuated, and that comparisons with others be dispensed with. This fosters a self-image that can in equal measure be realistic and optimistic.

I Like Her, Because I Like Myself: Self-Evaluation as a Source of Interpersonal Attitudes

2003 ◽  
Vol 50 (4) ◽  
pp. 239-246 ◽  
Author(s):  
Eva Walther ◽  
Claudia Trasselli
Keyword(s):  
Opposite Effect ◽  
Learning Phase ◽  
The Self ◽  
Attitude Formation ◽  
Formation Processes ◽  
False Feedback ◽  
Self Evaluation ◽  
Evaluation Group ◽  
Group A ◽  
The Difference

Abstract. Two experiments tested the hypothesis that self-evaluation can serve as a source of interpersonal attitudes. In the first study, self-evaluation was manipulated by means of false feedback. A subsequent learning phase demonstrated that the co-occurrence of the self with another individual influenced the evaluation of this previously neutral target. Whereas evaluative self-target similarity increased under conditions of negative self-evaluation, an opposite effect emerged in the positive self-evaluation group. A second study replicated these findings and showed that the difference between positive and negative self-evaluation conditions disappeared when a load manipulation was applied. The implications of self-evaluation for attitude formation processes are discussed.

A FACILE SYNTHESIS AND REACTIONS OF AMINO SELENOLO[2,3-b]PYRIDINE CARBOXYLATE

2015 ◽  
Vol 12 (1) ◽  
pp. 3910-3918 ◽  
Author(s):  
Dr Remon M Zaki ◽  
Prof Adel M. Kamal El-Dean ◽  
Dr Nermin A Marzouk ◽  
Prof Jehan A Micky ◽  
Mrs Rasha H Ahmed
Keyword(s):  
Biological Activity ◽  
Carbonyl Compounds ◽  
Mass Spectra ◽  
The Other ◽  
Pyridine Derivatives ◽  
Facile Synthesis ◽  
High Biological Activity ◽  
Basic Hydrolysis ◽  
Pyridine Carboxylate ◽  
Hydrolysis Of

 Incorporating selenium metal bonded to the pyridine nucleus was achieved by the reaction of selenium metal with 2-chloropyridine carbonitrile 1 in the presence of sodium borohydride as reducing agent. The resulting non isolated selanyl sodium salt was subjected to react with various α-halogenated carbonyl compounds to afford the selenyl pyridine derivatives 3a-f  which compounds 3a-d underwent Thorpe-Ziegler cyclization to give 1-amino-2-substitutedselenolo[2,3-b]pyridine compounds 4a-d, while the other compounds 3e,f failed to be cyclized. Basic hydrolysis of amino selenolo[2,3-b]pyridine carboxylate 4a followed by decarboxylation furnished the corresponding amino selenolopyridine compound 6 which was used as a versatile precursor for synthesis of other heterocyclic compound 7-16. All the newly synthesized compounds were established by elemental and spectral analysis (IR, 1H NMR) in addition to mass spectra for some of them hoping these compounds afforded high biological activity.

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