Non-covalently generated 3D supramolecular crystal structure in a new family of hybrid nitrates templated by piperazine: Thermal behavior and in vitro antimicrobial potential

Abstract

International audienceThree new hybrid nitrate materials based on transition metals and templated by piperazine, (C4H12N2)3[MII(H2O)6](NO3)8 with MII: Mn (1), Cu (2) and Co (3) have been investigated and crystallographically characterized. The single crystal X-ray diffraction study shows that the three complexes crystallize in the triclinic system, space group P1¯. Within the adopted supramolecular structures, isolated entities [MII(H2O)6]2+, NO3 − and (C4H12N2)2+ are held together through an extensive H-bonded system forming a three-dimensional network. The thermogravimetric analysis and temperature-dependent X-ray diffraction (TDXD) were used to follow the thermal behavior of the compounds. The TG analysis shows that, under heating, the precursors decompose into M2O3 via two steps: a dehydration followed by a total decomposition. The nature of the intermediate phases was studied using TDXD analysis. The orientation and strength of the non-covalent interactions binding the crystal, particularly the hydrogen bond network, were examined using density-functional theory (DFT) electron density and the non-covalent interaction (NCI) plot technique. The synthesized compounds were screened for antibacterial and antifungal activities against five Gram-positive, three Gram-negative bacteria and three fungi. © 2016 Elsevier Lt

Organically tuned white-light emission from two zero-dimensional Cd-based hybrids

“…In addition to their pertinent magnetic, 1-8 catalytic [9][10][11][12] and biological 9,[13][14][15] properties, organic-inorganic molecular hybrid materials (OIMHMs) exhibit excellent performance in solid-state emitter sources 16,17 as well as in photovoltaic solar cells. [18][19][20][21] Due to their wide band gap energy, low dimensional hybrid compounds are effectively used for optoelectronic devices such as light emitting and diode photo-detectors.…”

Template synthesis, DNA binding, antimicrobial activity, Hirshfeld surface analysis, and 1D helical supramolecular structure of a novel binuclear copper(ii) Schiff base complex

“…The secondary structure of helical complexes is determined by weak metal–ligand covalent interactions, halide ions such as iodide and supramolecular interactions such as hydrogen bonding and π⋯π stacking. 19–24 The design and synthesis of small synthetic systems that can recognize specific sites of DNA through formation of non-covalently associated complexes are important areas of much current interest. 25 Such physical complexation, more often, may produce important pharmacological effects by interfering with the biological processes in which DNA/RNA takes part.…”

Anion⋯anion self-assembly under the control of σ- and π-hole bonds

“…Anionic adducts with different topologies ( e.g. , either discrete systems such as dimers, 150,151 trimers, 152 and tetramers 153,154 or infinite chains 155,156 ) are formed thanks to the presence of one or both supramolecular synthons (Fig. 13).…”