Hydrogen-Bond and Metal-Ligand Coordination Bond Hybrid Supramolecular Capsules: Identification of Hemicapsular Intermediate and Dual Control of Guest Exchange Dynamics

2014 ◽  
Vol 9 (4) ◽  
pp. 1076-1082 ◽  
Author(s):  
Yuki Nito ◽  
Hirofumi Adachi ◽  
Naoaki Toyoda ◽  
Hikaru Takaya ◽  
Kenji Kobayashi ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Coordination Bond ◽  
Dual Control ◽  
Ligand Coordination ◽  
Metal Ligand

Unfolding and Mechanochemical Scission of Supramolecular Polymers Containing a Metal–Ligand Coordination Bond

2011 ◽  
Vol 44 (23) ◽  
pp. 9187-9195 ◽  
Author(s):  
Ramon Groote ◽  
Bartłomiej M. Szyja ◽  
Evgeny A. Pidko ◽  
Emiel J. M. Hensen ◽  
Rint P. Sijbesma
Keyword(s):  
Coordination Bond ◽  
Supramolecular Polymers ◽  
Ligand Coordination ◽  
Metal Ligand

Nature of the coordination bond in metal complexes of substituted pyridine derivatives. II. The far infrared spectra and metal–ligand force constants of copper complexes of 4-substituted pyridines

1968 ◽  
Vol 46 (2) ◽  
pp. 139-148 ◽  
Author(s):  
Patrick T. T. Wong ◽  
D. G. Brewer
Keyword(s):  
Infrared Spectra ◽  
Copper Complexes ◽  
Far Infrared ◽  
Coordination Bond ◽  
Force Constants ◽  
Nitrogen Ligand ◽  
Substituted Pyridines ◽  
Ligand Coordination ◽  
Chlorine Bond ◽  
Metal Ligand

Infrared spectra, including the lower frequency region, of copper (II) complexes of the type [CuL2Cl2], where L = 4-methylpyridine, 4-carbinylpyridine, pyridine, 4-acetylpyridine, 4-pyridinecarboxamide, 4-carbomethoxypyridine, and 4-cyanopyridine have been measured. The substituent effect upon the copper–nitrogen (ligand) and copper–chlorine stretching frequencies has also been examined. It was found that the substituents on the pyridine ring not only affected the nature of copper–nitrogen bond, but also the copper–chlorine bond. It appears that an entirely delocalized system exists, involving the chlorine atoms and the substituents in the complexes. Force constants associated with the coordination bond between copper and the nitrogen of the ligands have been calculated by means of an IBM 1620 computer. By comparison of the copper–nitrogen stretching frequencies with the corresponding force constants, and the heats of coordination, it may be concluded that the magnitude of the metal–ligand stretching frequency is directly related to the metal–ligand coordination bond strength for the systems under study.

scholarly journals Self-Assembled Nanomaterials Based on Complementary Sn(IV) and Zn(II)-Porphyrins, and Their Photocatalytic Degradation for Rhodamine B Dye

Molecules ◽  
2021 ◽  
Vol 26 (12) ◽  
pp. 3598
Author(s):  
Nirmal K. Shee ◽  
Hee-Joon Kim
Keyword(s):  
Aqueous Solution ◽  
Visible Light Irradiation ◽  
Rhodamine B ◽  
Self Assembly ◽  
The Self ◽  
Assembly Process ◽  
Absorption Bands ◽  
Ligand Coordination ◽  
Rhodamine B Dye ◽  
Metal Ligand

A series of porphyrin triads (1–6), based on the reaction of trans-dihydroxo-[5,15-bis(3-pyridyl)-10,20-bis(phenyl)porphyrinato]tin(IV) (SnP) with six different phenoxy Zn(II)-porphyrins (ZnLn), was synthesized. The cooperative metal–ligand coordination of 3-pyridyl nitrogens in the SnP with the phenoxy Zn(II)-porphyrins, followed by the self-assembly process, leads to the formation of nanostructures. The red-shifts and remarkable broadening of the absorption bands in the UV–vis spectra for the triads in CHCl3 indicate that nanoaggregates may be produced in the self-assembly process of these triads. The emission intensities of the triads were also significantly reduced due to the aggregation. Microscopic analyses of the nanostructures of the triads reveal differences due to the different substituents on the axial Zn(II)-porphyrin moieties. All these nanomaterials exhibited efficient photocatalytic performances in the degradation of rhodamine B (RhB) dye under visible light irradiation, and the degradation efficiencies of RhB in aqueous solution were observed to be 72~95% within 4 h. In addition, the efficiency of the catalyst was not impaired, showing excellent recyclability even after being applied for the degradation of RhB in up to five cycles.

Template-free multicomponent coordination-driven self-assembly of Pd(ii)/Pt(ii) molecular cages

2014 ◽  
Vol 50 (18) ◽  
pp. 2239-2248 ◽  
Author(s):  
Sandip Mukherjee ◽  
Partha Sarathi Mukherjee
Keyword(s):  
Self Assembly ◽  
Assembly Process ◽  
Molecular Cages ◽  
Recent Developments ◽  
Ligand Coordination ◽  
Template Free ◽  
Metal Ligand

This article summarizes the recent developments in the construction of multicomponent molecular hollowed-out cages through the metal–ligand coordination-driven self-assembly process, with a focus on the decreasing relevance of the use of templates.

Effect of the hydrogen bond network in carbonic anhydrase II zinc binding site. A theoretical study

1998 ◽  
Vol 76 (7) ◽  
pp. 1027-1032 ◽  
Author(s):  
Silvia Álvarez-Santos ◽  
Àngels González-Lafont ◽  
José M Lluch
Keyword(s):  
Hydrogen Bond ◽  
Carbonic Anhydrase ◽  
Binding Site ◽  
Zinc Binding ◽  
Carbonic Anhydrase Ii ◽  
Am1 Method ◽  
Hydrogen Bond Network ◽  
Zinc Binding Site ◽  
Bond Network ◽  
Metal Ligand

The hydrogen bond network influence on the carbonic anhydrase II (CAII) zinc binding site has been studied theoretically by using the semiempirical AM1 method. To this aim, quantum mechanical reduced models of wild-type CAII and several CAII variants have been constructed. We have shown that, when a direct metal ligand donates a hydrogen bond to an indirect metal ligand, the first-shell residues enhance their electrostatic interaction with the zinc cation. Thus, the hydrogen-bond network is able to modulate the zinc binding affinity and the zinc-water pKa.Key words: hydrogen bond network, carbonic anhydrase II, Zn2+ metalloenzyme ligands.

scholarly journals The structural diversity of heterocycle-fused potassium cyclopentadienides

RSC Advances ◽  
2019 ◽  
Vol 9 (50) ◽  
pp. 29195-29204 ◽  
Author(s):  
Ilya E. Nifant'ev ◽  
Alexander A. Vinogradov ◽  
Mikhail E. Minyaev ◽  
Pavel D. Komarov ◽  
Konstantin A. Lyssenko ◽  
...  
Keyword(s):  
Crystal Packing ◽  
Structural Diversity ◽  
Ligand Coordination ◽  
Metal Ligand

Heterocycle-fused cyclopentadienides of potassium demonstrate remarkable diversity in metal–ligand coordination and crystal packing.

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