Molecular structure intermolecular hydrogen bonding

Hydroxypyridine 1-oxide is insoluble in chloroform and other suitable solvents, and, although the solid-state infrared spectrum indicates that strong intermolecular hydrogen bonding occurs, no additional structural conclusions could be reached. Jaffe has attempted to deduce the structure of 4-hydroxypyridine 1-oxide using the Hammett equation and molecular orbital calculations. This tautomeric compound reacts with diazomethane to give both the 1- and 4-methoxy derivatives, " and the relation of its structure to other chemical reactions has been discussed by Hayashi. ... 

Some quinones, having the ability to form intra- and/or intermolecular hydrogen bonds, exhibit high molecular hyperpolarizability and are third-order nonlinear optical (NLO) materials. Compound 39 has a %(3) of 5 x 10 11 esu at 1.9 pm, and is a third-order NLO material.23 The optoelectric properties of quinoid compounds correlate with their structures in crystals or on thin films.23... 

Over the years, a large number of models of water structure have been developed in an attempt to reconcile all the known physical properties of water and to arrive at a molecular description of water that accounts correctly for its behavior over a large range of thermodynamic conditions. Early models of water structure have been categorized by Fennema (1996) and Ball (2001) into three general types mixture, uniformist, and interstitial. Mixture models are based on the concept of intermolecular hydrogen bonds... 

As mentioned in the introduction section, the photoluminescent properties of molecular assemblies depend on the assembled structures of photoluminescent moieties [11, 21-34]. If assembled structures of photoluminescent moieties are changed by external stimuli, stimuli-responsive photoluminescent materials can be prepared. Recently, we have reported on anthracene, pyrene and naphthalene derivatives 1-3 having dendritic moieties which contain amide moieties to form intermolecular hydrogen bonds (Fig. 2) [28-30]. These dendritic moieties are known to be... 

When short intermolecular contacts are apparent in the crystallographic data, their presence is due to either intermolecular hydrogen bonding or steric interactions caused by bulky substituents (9). For some of these situations, we simulated both the isolated molecule and the molecular structure perturbed by neighboring molecules in the unit cell to establish that this is the case (10,11). ... 

Fig. 2.3.6. Structure, derived from molecular modeling, of 2 with N-acetylphenylalanine in water (intermolecular hydrogen bonds are shown as broken lines).

---