Triazine molecule, hydrogen bonding

Beton and co-workers extended the hydrogen bonding approach to two-component systems, generating a number of structures that utilise different molecular motifs.24 26 In the case of perylene tetracarboxylic diimide (PTCDI) co-adsorbed with melamine (1,3,5-triazine-2,4,6-triamine) on a silver-terminated silicon surface, a network is formed in which the straight edges correspond to PTCDI with melamine at the vertices (Figure 11.6). The network shows large-area pores that the authors used to trap heptamers of C6o molecules. 

X-Ray investigation of the thiazolo[3,2-A][l,2,4]triazine compound 61 <2001H(55)2189> showed that this compound in the crystal phase exists as a solvate with dimethylformamide (DMF), the amide group is coplanar to the benzene ring (the respective torsion angles are below 4°), and intermolecular hydrogen bonds with the DMF molecules can be found. 

The data obtained for 6-amino-3-methyl-l,2,4-triazin-5-one (17) show the surprising result that the non-ionic structure (17a) contributes little to the resonance while the ionic structures (17b-f) have to be considered in the crystalline state, which is probably due to the stabilization of these structures by hydrogen bonding or other crystal fields acting on this molecule. 

Using infrared analysis they showed that one of the binding mechanisms is ionic bond formation, following proton transfer from the humic acids to the s-triazine molecules. Another mechanism found by Senesi and Testini (1982) was hydrogen bonding. 

In the triazine and 9EA MIP model systems predictions may be made based on previous studies of closely related solution complexes. Of particular relevance is the work by Welhouse and Bleam [101] on solution complexes of ATR formed by hydrogen bonding with various small molecules and the work by Lancelot on the... 

For l,2,3-benzotriazin-4(3//)-one (12a),25 at least in the crystalline state, the 3//-tautomer is the correct structure. The N1-N2 double bond is 1.274 A and therefore shorter than in monocyclic 1,2,3-triazines (1.314-1.329 A). The molecules are bonded together by almost linear N-H-O hydrogen bonds into polymers. X-ray crystallographic data have also been published for the N3-substituted 1,2,3-benzotriazin-4(3//)-ones 3,37 12b38 and 12c.2e... 

N NMR spectra of the parent 1,2,4-triazine have been measured in various solvents in the search for insights into solvent-induced, site-oriented electric charge redistributions and solvent solute hydrogen bonding effects in an unsymmetrical molecule. A sharp contrast is observed in the solvent effects on N1 and N2 with respect to N4. N1 and N2 exhibit a remarkable affinity to hydrogen bond donor solvents, in contrast, N4 appears to not be influenced by solvent effects (Table 8)."... 

Traditional methods for dyeing cotton depended on formation of insoluble dye molecules on the fibers, or of hydrogen bonds between the dye molecules and the fibers, or both. However, two classes of dyes that react covalently have now been used extensively in the production of colored polysaccharide derivatives. The diazine and triazine types of... 

These observations suggest that hydrogen bonding is possible between the corresponding attraction and repulsion zones of a target molecule, possibly a protein. For the s-triazines, the... 

This also suggests that each triazine molecule can undergo hydrogen bonding with two sites. The N of the alkyamino groups are repulsive to the proton, whereas the N atom in position 5 on the ring is somewhat attractive. Nitrofen, which is not a DCMU-type inhibitor, presents a different case the molecule is somewhat twisted, so the interaction map depends upon the relative position between point charge and the nitrofen molecule. 

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