منابع مشابه
Structure and Hydrogen Bonding in CaSiD1+ x: Issues About Covalent Bonding
We report here our high-resolution neutron powder diffraction and neutron vibrational spectroscopy study of CaSiD1+x along with first-principles calculations, which reveal the deuterium structural arrangements and bonding in this novel alloy hydride. Both the structural and spectroscopic results show that, for x > 0, D atoms start occupying a Ca3Si interstitial site. The corresponding Si-D bond...
متن کاملConstructing covalent organic frameworks in water via dynamic covalent bonding
The formation of keto-enamine based crystalline, porous polymers in water is investigated for the first time. Facile access to the Schiff base reaction in water has been exploited to synthesize stable porous structures using the principles of Dynamic Covalent Chemistry (DCC). Most credibly, the water-based Covalent Organic Frameworks (COFs) possess chemical as well as physical properties such a...
متن کاملThe Physical Origin of Covalent Bonding
Up to about the seventeenth century atomists believed that there were mechanical hookups between atoms. Toward the end of that century Isaac Newton surmised that, analogous to the gravitational forces between masses, there are additional forces between atoms that are attractive at large distances and repulsive at short distances. Around 1810 Berzelius, involved in the development of electrolysi...
متن کاملCovalent bonding: the role of exchange effects.
It is stressed that the two-center exchange energy components lead to a significant lowering of the total molecular energy because of exclusion of self-repulsion, and this is inevitable for covalent bond formation. The success of the two-center bond order index relies on the fact that it gives a qualitative estimate of this important phenomenon.
متن کاملNon-covalent synthesis of supermicelles with complex architectures using spatially confined hydrogen-bonding interactions
Nature uses orthogonal interactions over different length scales to construct structures with hierarchical levels of order and provides an important source of inspiration for the creation of synthetic functional materials. Here, we report the programmed assembly of monodisperse cylindrical block comicelle building blocks with crystalline cores to create supermicelles using spatially confined hy...
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ژورنال
عنوان ژورنال: Journal of the Fuel Society of Japan
سال: 1991
ISSN: 0369-3775,2185-226X
DOI: 10.3775/jie.70.8_790