Cooperative hydrogen bonds of macromolecules. 2. Two-dimensional cooperativity in the binding of poly(4-vinylpyridine) to poly(4-vinylphenol)

Article Abstract:

A study investigates the hydrogen bond interaction of poly(4-vinylphenol) (PVF), ligated by a 20 mol/mol excess of pyridine-[d.sub.5] (PD) in tetrahydrofuran-[d.sub.8], with poly(4-vinylpyridine) (PVP), using liquid and solid-state nuclear magnetic resonance and quantum mechanical calculations. It is shown that PVP substitutes PD in its hydrogen bond with PVF because of its cooperative interaction, thus forming a PVF-PVP complex, which gradually precipitates from solution.

Science & research, Research, Observations, Quantum theory, Quantum mechanics, Hydrogen bonding, Hydrogen bonds, Macromolecules

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Role of conformation in the electronic properties of chemisorbed pyridine on Cu(110): An STM/STS study

Article Abstract:

Pyridine was chemisorbed on Cu(110) using low temperature STM and STS measurement. It was found that N-bonded and tilted pyridine species coexist on Cu(110) from extremely low total pyridine coverage and at low coverage the tilted pyridine species predominates on the surface, but as the total surface coverage of pyridine increases, the molecules stand up until the upright geometry becomes favored.

Usage, Scanning tunneling microscopy, Copper compounds

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