نتایج جستجو برای: intermolecular hydrogen bonding

تعداد نتایج: 179083  

2008
Niaz Muhammad M. Nawaz Tahir Saqib Ali Zia-ur-Rehman Muhammad Akram Kashmiri

The two mol-ecules in the asymmetric unit of the title compound, C(13)H(16)O(2), form dimers through O-H⋯O hydrogen bonding, resulting in R(2) (2)(8) rings. Each carboxyl- O atom is involved in inter-amolecular C-H⋯O hydrogen bonds, forming five-membered rings. There exist dissimilar dihedral angles within the two mol-ecules, for example the carboxylate and isopropyl groups make dihedral angles...

2014
Deepti Karandur Ka-Yiu Wong B. Montgomery Pettitt

Experimentally, the solubility of oligoglycines in water decreases as its length increases. Computationally, the free energy of solvation becomes more favorable with chain length for short (n = 1-5) oligoglycines. We present results of large scale simulations with over 600 pentaglycines at varying concentrations in explicit solvent to consider the mechanism of aggregation. The solubility limit ...

Journal: :Organic & biomolecular chemistry 2014
Binglian Bai Jie Ma Jue Wei Jianxi Song Haitao Wang Min Li

A 4-nitrobenzohydrazide derivative, N-(3,4,5-octyloxybenzoyl)-N'-(4'-nitrobenzoyl)hydrazine (C8), was synthesized. It could form stable gels in some of the tested organic solvents. The wide-angle X-ray diffraction analysis showed that the xerogels exhibited a layered structure. SEM images revealed that the molecules self-assembled into fibrous aggregates in the xerogels. FT-IR studies confirmed...

Journal: :Chemphyschem : a European journal of chemical physics and physical chemistry 2016
Sepideh Afsari Zhihai Li Eric Borguet

Utilizing pure amine hydrogen bonding is a novel approach for constructing two-dimensional (2D) networks. Further, such systems are capable of undergoing structural modifications due to changes in pH. In this study, we designed a 2D network of triaminobenzene (TAB) molecules that by varying the pH from neutral to acidic, form either ordered or disordered structures on Au(111) surface as reveale...

2016
Christina J. Newcomb Shantanu Sur Sungsoo S. Lee Jeong Min Yu Yan Zhou Malcolm L. Snead Samuel I. Stupp

The nanostructures of self-assembling biomaterials have been previously designed to tune the release of growth factors in order to optimize biological repair and regeneration. We report here on the discovery that weakly cohesive peptide nanostructures in terms of intermolecular hydrogen bonding, when combined with low concentrations of osteogenic growth factor, enhance both BMP-2 and Wnt mediat...

Journal: :Acta Crystallographica Section C Crystal Structure Communications 2000

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