Head-to-Tail interlocking aromatic rings of a hydrazine functionalized Schiff base for the development of Nano-aggregates with blue emission: Structural and spectroscopic characteristics was written by Kumar Mudi, Prafullya;Das, Ajit;Mahata, Nagendranath;Biswas, Bhaskar. And the article was included in Journal of Molecular Liquids in 2021.COA of Formula: C12H9NO This article mentions the following:
We report the synthesis, physicochem. and morphol. characterization, supramol. interactions and aggregation-induced blue emission of a newly developed Schiff base, 1,2-bis(phenyl(pyridin-2-yl)methylene)hydrazine (P18). The compound was synthesized through a condensation reaction between hydrazine and 2-benzoylpyridine under reflux in ethanol. The photophys. behavior of the Schiff base was studied in both monomeric and aggregated forms. Interestingly, the mol. aggregate showed a significant blue shift with â?20 fold higher fluorescence intensity with lifetime, 0.99 ns in the aqueous phase than that of monomeric form, attributed to the development of J-type aggregation. The crystal structure, C-HÂ·Â·Â·Ï and Ï…Ï interactions, were enumerated to decipher the nature of aggregation. The Schiff base consisting of four aromatic rings (two pyridine and two Ph rings) displayed a short C-HÂ·Â·Â·Ï and a long distant ÏÂ·Â·Â·Ï interactions causing a head-to-tail type interlocking of aromatic rings. Energy framework anal. confirmed the predominance of dispersive forces (-192.4 kJ/mol) to the cluster of mols., thus playing a significant role in the restriction of intramol. motion of the aromatic rings of P18. A restrain on the rotational probability of = N-N = and Ar-C- bonds leads to an enhancement of an intense fluorescence property of nano-aggregate with blue light emission in solid state. The propagation of the rectangular-shaped monomeric probe in the nano-aggregate with an average hydrodynamic size of 270(±3) nm was established with field emission SEM, dynamic scattering light, and electron dispersive X-ray spectral anal. In the experiment, the researchers used many compounds, for example, Phenyl(pyridin-2-yl)methanone (cas: 91-02-1COA of Formula: C12H9NO).
Phenyl(pyridin-2-yl)methanone (cas: 91-02-1) belongs to pyridine derivatives. In contrast to benzene, Pyridine’s electron density is not evenly distributed over the ring, reflecting the negative inductive effect of the nitrogen atom. One of the examples of pyridines is the well-known alkaloid lithoprimidine, which is an A3 adenosine receptor antagonist and N,N-dimethylaminopyridine (DMAP) analog, commonly used in organic synthesis.COA of Formula: C12H9NO