Flexible Square Supramolecular Rings with Hydrogen-Bonded Bushing in Solid-State Oxalurate Complexes:  Versatility of the Oxalurate Ligand in Covalent and Noncovalent Binding

2002 ◽  
Vol 41 (17) ◽  
pp. 4599-4604 ◽  
Author(s):  
Larry R. Falvello ◽  
Raquel Garde ◽  
Milagros Tomás
Molecules ◽  
2021 ◽  
Vol 26 (4) ◽  
pp. 926
Author(s):  
Malose J. Mphahlele ◽  
Eugene E. Onwu ◽  
Marole M. Maluleka

The conformations of the title compounds were determined in solution (NMR and UV-Vis spectroscopy) and in the solid state (FT-IR and XRD), complemented with density functional theory (DFT) in the gas phase. The nonequivalence of the amide protons of these compounds due to the hindered rotation of the C(O)–NH2 single bond resulted in two distinct resonances of different chemical shift values in the aromatic region of their 1H-NMR spectra. Intramolecular hydrogen bonding interactions between the carbonyl oxygen and the sulfonamide hydrogen atom were observed in the solution phase and solid state. XRD confirmed the ability of the amide moiety of this class of compounds to function as a hydrogen bond acceptor to form a six-membered hydrogen bonded ring and a donor simultaneously to form intermolecular hydrogen bonded complexes of the type N–H···O=S. The distorted tetrahedral geometry of the sulfur atom resulted in a deviation of the sulfonamide moiety from co-planarity of the anthranilamide scaffold, and this geometry enabled oxygen atoms to form hydrogen bonds in higher dimensions.


2000 ◽  
Vol 104 (49) ◽  
pp. 11801-11804 ◽  
Author(s):  
Takashi Ikeda ◽  
Michiel Sprik ◽  
Kiyoyuki Terakura ◽  
Michele Parrinello

2018 ◽  
Vol 140 (14) ◽  
pp. 4940-4944 ◽  
Author(s):  
Qianli Chu ◽  
Andrew J. E. Duncan ◽  
Giannis S. Papaefstathiou ◽  
Tamara D. Hamilton ◽  
Manza B. J. Atkinson ◽  
...  

2019 ◽  
Vol 43 (23) ◽  
pp. 9090-9105 ◽  
Author(s):  
Kannan Ramamurthy ◽  
E. J. Padma Malar ◽  
Chellappan Selvaraju

Fluorescence emission spectrum of ketocoumarin dimers in an alcohol:water binary mixture and the solid state.


1990 ◽  
Vol 8 (4) ◽  
pp. 395-407 ◽  
Author(s):  
Margaret C. Etter ◽  
Diana L. Parker ◽  
Shiyamalie R. Ruberu ◽  
Thomas W. Panunto ◽  
Doyle Britton

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