Compounds containing both a ring nitrogen atom and a hydroxyl (OH) or amino (NH2) group are usually relatively high-melting solids.
Carboxylic acids of heterocycles containing a ring nitrogen atom usually melt at higher temperatures than those containing ring oxygen or sulfur atoms, because of hydrogen bonding.
In addition, the introduction of four methyl groups adjacent to the piperidine ring nitrogen atom remarkably enhanced ERα binding affinity.
This compound consists of Cd2 μ-Cl 2 corner-sharing chains bridged by PymNH2 through the endocyclic ring nitrogen atoms.
These improvements in activity are rationalized by X-ray crystallography analysis, which show that the tropane ring nitrogen atom moves into direct contact with Asp202 (arginase II numbering).
Adsorbates that bind primarily through a ring nitrogen atom delay both the upd and opd processes, depending on the bond strength of the adsorbed layer.
The inhibitory strengths of the synthesized compounds are shown to correlate well with Mulliken charges on the head group ring nitrogen atoms making it possible to design likely candidate molecules having improved protein kinase Cα inhibitory activity.
The ligand is covalently bonded through a deprotonated tetrazole ring nitrogen atom in complexes 1 4 and via a thiolato sulfur atom in complexes 5 and 6, in which the ligand acts as uninegative monodentate.
The dual DNA intercalators have three main parts: an alkylating unit (represented by two halo-alkyl-ester chains), an intercalator unit (five- or six-membered ring nitrogen heterocycle) and an acetophenone skeleton linker.
Structure activity relationship studies revealed that the presence of phenyl substituents on both ring nitrogen atoms and vinyl or phenyl substituents in position 5 are crucial for high activity.
In the complexes, the newly generated ligand is bonded through thiadiazole ring nitrogen and oxygen of acitimidate group, thus acting as N, O bidentate ligand producing a six membered chelate ring.
