Synthesis, crystal structure, spectral, dielectric characteristics and conduction mechanism of two novel carboxylates of 1-benzhydrylpiperazine

Abstract

Two new 1-benzhydrylpiperazinium carboxylates with tartrate and maleate, (C 17 H 21 N 2 )(C 4 H 5 O 6 ) and (C 17 H 22 N 2 )(C 4 H 3 O 4 ) 2 , have been synthesized and characterized. Crystal structure determinations show that the compounds crystallize in the P2 1 and the P2 1 /c space groups of the monoclinic system, respectively. Only in the maleate the organic group is protonated on both nitrogen atoms of piperazine ring. The infrared spectra of these compounds reported from 400 to 4000 cm -1 confirmed the presence of the principal bands assigned to the internal modes of cations and anions of both compounds. The optical band gaps were calculated and found to be 3.46 and 4.14 eV for tartrate and maleate, respectively. Different molecular motions were determinate via dielectric relaxation spectroscopy. Measurements of AC conductivity as a function of frequency at different temperatures indicated the hopping conduction mechanism. The number of 13 C CP-MAS NMR lines is in good agreement with the crystallographic data. Graphical abstract

A zero dimensional hybrid organic- inorganic perovskite CuCl4 based: Synthesis, crystal structure, vibrational, optical properties, DFT and TDFT calculations, dielectric properties and biological activity

“…The disc diffusion method showed that, the effect of both the trans-2,5 dimethylpiperazine Fig.17. Our results join many previous researches, where the antibacterial activity of newly synthesized compound depends on the membrane structure [45]. The difference of sensitivity, found between Gram-positive and Gram-negative bacteria to the the trans-2,5 dimethylpiperazine and our newly synthetized compound can be attributed to the outer membrane of Gram-negative bacteria that usually forms a physical barrier to most antibiotic.…”