Biomolecular Halogen Bonds

2014 ◽  
pp. 241-276 ◽  
Author(s):  
P. Shing Ho
Keyword(s):  
Halogen Bonds

Abrupt spin crossover in iron(iii) complexes with aromatic anions

2019 ◽  
Vol 48 (41) ◽  
pp. 15515-15520 ◽  
Author(s):  
Sharon E. Lazaro ◽  
Adil Alkaş ◽  
Seok J. Lee ◽  
Shane G. Telfer ◽  
Keith S. Murray ◽  
...  
Keyword(s):  
Transition Temperature ◽  
Spin Crossover ◽  
Spin Transition ◽  
Halogen Bonds ◽  
Aromatic Anions

Two iron(iii) complexes, [Fe(qsal-X)2]OTs·nH2O, are found to exhibit abrupt spin crossover with the spin transition temperature substituent dependent, and X⋯O halogen bonds linking the spin centres.

scholarly journals Convenient Access to Functionalized Non-Symmetrical Atropisomeric 4,4′-Bipyridines

Compounds ◽  
2021 ◽  
Vol 1 (2) ◽  
pp. 58-74
Author(s):  
Emmanuel Aubert ◽  
Emmanuel Wenger ◽  
Paola Peluso ◽  
Victor Mamane
Keyword(s):  
Solid State ◽  
Intermolecular Interactions ◽  
Medicinal Chemistry ◽  
Crystal Packing ◽  
Cross Coupling ◽  
Coupling Reactions ◽  
Halogen Bonds ◽  
Cross Coupling Reactions ◽  
Cyano Groups ◽  
Post Functionalization

Non-symmetrical chiral 4,4′-bipyridines have recently found interest in organocatalysis and medicinal chemistry. In this regard, the development of efficient methods for their synthesis is highly desirable. Herein, a series of non-symmetrical atropisomeric polyhalogenated 4,4′-bipyridines were prepared and further functionalized by using cross-coupling reactions. The desymmetrization step is based on the N-oxidation of one of the two pyridine rings of the 4,4′-bipyridine skeleton. The main advantage of this methodology is the possible post-functionalization of the pyridine N-oxide, allowing selective introduction of chlorine, bromine or cyano groups in 2- and 2′-postions of the chiral atropisomeric 4,4′-bipyridines. The crystal packing in the solid state of some newly prepared derivatives was analyzed and revealed the importance of halogen bonds in intermolecular interactions.

Controlling the molecular arrangement of racemates through weak interactions: the synergy between π-interactions and halogen bonds

2021 ◽  
Author(s):  
Carlos Romero-Nieto ◽  
A. de Cózar ◽  
Elzbieta Regulska ◽  
John B. Mullenix ◽  
Frank Rominger ◽  
...  
Keyword(s):  
Weak Interactions ◽  
Halogen Bonds ◽  
Π Interactions ◽  
Molecular Arrangement ◽  
Π Stacking

The combination of halogend bonds from PO and N-moieties with π-stacking leads to sort out R- and S-isomers into homoleptic, porous assemblies.

scholarly journals Cooperation/Competition between Halogen Bonds and Hydrogen Bonds in Complexes of 2,6-Diaminopyridines and X-CY3 (X = Cl, Br; Y = H, F)

Symmetry ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 766
Author(s):  
Barbara Bankiewicz ◽  
Marcin Palusiak
Keyword(s):  
Complex Formation ◽  
Hydrogen Bonds ◽  
Dft Calculations ◽  
Electrostatic Interactions ◽  
Dipole Moments ◽  
Main Role ◽  
Halogen Bonds ◽  
Topological Parameters ◽  
Leading Role ◽  
The Impact

The DFT calculations have been performed on a series of two-element complexes formed by substituted 2,6-diaminopyridine (R−PDA) and pyridine (R−Pyr) with X−CY3 molecules (where X = Cl, Br and Y = H, F). The primary aim of this study was to examine the intermolecular hydrogen and halogen bonds in the condition of their mutual coexistence. Symmetry/antisymmetry of the interrelation between three individual interactions is addressed. It appears that halogen bonds play the main role in the stabilization of the structures of the selected systems. However, the occurrence of one or two hydrogen bonds was associated with the favourable geometry of the complexes. Moreover, the impact of different substituent groups attached in the para position to the aromatic ring of the 2,6-diaminopyridine and pyridine on the character of the intermolecular hydrogen and halogen bonds was examined. The results indicate that the presence of electron-donating substituents strengthens the bonds. In turn, the presence of electron-withdrawing substituents reduces the strength of halogen bonds. Additionally, when hydrogen and halogen bonds lose their leading role in the complex formation, the nonspecific electrostatic interactions between dipole moments take their place. Analysis was based on geometric, energetic, and topological parameters of the studied systems.

Comparison of Anion‐Anion Halogen Bonds with Neutral‐Anion Halogen Bonds in the Gas Phase and Polar Solvents

ChemPlusChem ◽  
2021 ◽  
Vol 86 (2) ◽  
pp. 232-240
Author(s):  
Ying Li ◽  
Lingpeng Meng ◽  
Yanli Zeng
Keyword(s):  
Gas Phase ◽  
Halogen Bonds ◽  
Polar Solvents

Cooperation and competition of hydrogen and halogen bonds in 2D self-assembled nanostructures based on bromine substituted coumarins

2019 ◽  
Vol 43 (44) ◽  
pp. 17182-17187 ◽  
Author(s):  
Bao Zha ◽  
Jinxing Li ◽  
Juntian Wu ◽  
Xinrui Miao ◽  
Min Zhang
Keyword(s):  
Coumarin Derivatives ◽  
Carbonyl Groups ◽  
Halogen Bonds ◽  
Cooperation And Competition ◽  
Self Assembled ◽  
Substituted Coumarins

Three coumarin derivatives (Co16, 6-Br-Co16 and 6,8-Br-Co16) with ester, ether, and carbonyl groups and different numbers of bromine substituents on the coumarin cores were synthesized.

Self-assembly of conducting cocrystals via iodine⋯π(Cp) interactions

CrystEngComm ◽  
2017 ◽  
Vol 19 (34) ◽  
pp. 5114-5121 ◽  
Author(s):  
Yury V. Torubaev ◽  
Konstantin A. Lyssenko ◽  
Petro Y. Barzilovich ◽  
George A. Saratov ◽  
Mobin M. Shaikh ◽  
...  
Keyword(s):  
Self Assembly ◽  
Halogen Bonds

Conducting crystals of alternating ferrocene and diiodoacetylene units assembled into supramolecular 1-D chains via I⋯π(Cp) halogen bonds were prepared and structurally characterized.

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