Most of the compounds have physiologically active properties, and their biological properties are often attributed to the heteroatoms contained in their molecules, and most of these heteroatoms also appear in cyclic structures. A Journal, Journal of Molecular Structure called Energetic features of antiparallel stacking and hydrogen bonding interactions in two coordination complexes bearing 1,10-phenanthroline-2,9-dicarboxylic acid, Author is Akbari, Mahmood; Mirzaei, Masoud; Saljooghi, Amir Sh; Sadeghzadeh, Samaneh; Lotfian, Nahid; Aghamohammadi, Maral; Notash, Behrouz; Mague, Joel T.; Gomila, Rosa M.; Frontera, Antonio, which mentions a compound: 66-71-7, SMILESS is C1=CC3=C(C2=NC=CC=C12)N=CC=C3, Molecular C12H8N2, HPLC of Formula: 66-71-7.
Two new metal-organic complexes, [Co(phen)(PDA)H2O]·CH3CN·H2O (1), (phen = 1,10-phenanthroline, PDA = 1,10-phenanthroline-2,9-dicarboxylate) and [Ce2(PDA)3(H2O)2]·3H2O (2) have been synthesized and characterized by elemental anal., IR spectroscopy, and single-crystal X-ray crystallog. Structural characterization by single-crystal X-ray diffraction shows that in 1 the cobalt ion forms a discrete seven-coordinated complex with a distorted pentagonal bipyramidal geometry around the metal center. These discrete units are further packed into 3-D supramol. assemblies by different kinds of the noncovalent interactions. Complex 2 consists of a 1D coordination polymeric structure with the cerium ion coordinated by PDA and water in the form of left-handed and right-handed helixes. The extended aromatic systems of PDA and phen have a strong tendency to establish antiparallel π···π stacking interactions generating interesting assemblies in the solid state of 1. They have been studied theor. using DFT calculations and characterized by means of the quantum theory of “”atoms-in-mols.”” (QTAIM) and the noncovalent interaction (NCI) plot methods. This study is useful to understand in more detail the energetic and structural stability of these categories of metal-organic complexes. The results reported herein suggest that the antiparallel π-stacking interactions involving the neutral and, in principle innocent, phen auxiliary ligand are energetically very relevant in the solid state of 1.
The article 《Energetic features of antiparallel stacking and hydrogen bonding interactions in two coordination complexes bearing 1,10-phenanthroline-2,9-dicarboxylic acid》 also mentions many details about this compound(66-71-7)HPLC of Formula: 66-71-7, you can pay attention to it, because details determine success or failure
Reference:
Piperazine – Wikipedia,
Piperazines – an overview | ScienceDirect Topics