Thermal, magnetic and spectral properties of metal quinone complexes

A common tattoo chemical for energy storage: henna plant-derived naphthoquinone dimer as a green and sustainable cathode material for Li-ion batteries

“…1). 25,[34][35][36] In addition, the aforementioned hydroxyl group frequency at $3300 cm À1 was found to completely disappear as the H atom of the hydroxyl group is replaced by Li; this is accompanied by the appearance of a new sharp peak at 663 cm À1 corresponding to the stretching frequency of the Li-O chelate (Fig. 3c).…”

Made From Henna! A Fast-Charging, High-Capacity, and Recyclable Tetrakislawsone Cathode Material for Lithium Ion Batteries

“…This observation represents a red shift of the aromatic region due to the extension of conjugation and delocalization of negative charge that occurs upon metal coordination to the lawsone subunits of TKL. The molecule therefore exhibits augmented aromatic character upon each lithium coordination event. , The aromatic frequency further intensified upon the addition of two and three Li, reaching maximum intensity upon the addition of four Li. These observations were precisely echoed by the intensification and red shift of the analogous band at 1526 cm –1 in the experimental data (Figure b).…”

“…The molecule therefore exhibits augmented aromatic character upon each lithium coordination event. 38,39 The aromatic frequency further intensified upon the addition of two and three Li, reaching maximum intensity upon the addition of four Li. These observations were precisely echoed by the intensification and red shift of the analogous band at 1526 cm −1 in the experimental data (Figure 3b).…”

Thermal and Spectral Studies of Transition Metal Complexes of 2-Bromo-3-Hydroxynaphthalene-1,4-Dione: Evaluation of Antibacterial Activity Against Six Bacterial Strains

“…The ligand was synthesized according to the literature reported procedure and characterized by 1 H and 13 C NMR (Nuclear Magnetic Resonance), FTIR, elemental analysis, and GC-MS (Gas chromatography-Mass spectroscopy) studies. [25] The procedure used to synthesize the complexes is similar to reported in the literature.…”

“…[5] Hydroxynaphthoquinones provide the bidentate or tridentate coordination sites to metal ions; they can also coordinate metal ions in different oxidation states. [6][7][8][9][10][11][12][13][14][15] Hydroxynaphthoquinones provide flexible coordination modes for the binding that depend on the experimental conditions; for example, triethylamine can lead to cis, cis coordination of ligands, and sodium acetate leads to trans, trans coordination of ligand. [16] Heteroleptic complexes can be synthesized with 2,2'-bipyridine and 1,10-phenanthroline.…”