The first (tripyrrinato)nickel(II) complexes, TrpyNiX with X = Cl, Br, I: synthesis, structures and solvent coordination was written by Broering, Martin;Prikhodovski, Serguei;Brandt, Carsten D.. And the article was included in Journal of the Chemical Society, Dalton Transactions in 2002.Safety of 3,5-Dimethylpyridine 1-oxide This article mentions the following:
A first series of Ni(II) complexes I (X = Cl, L = H2O; X = Br, I, X = null) of the new tripyrrolic ligand 2,15-dimethyl-3,4,8,9,13,14-hexaethyltripyrrin was prepared and characterized by spectroscopic and structural means. The coordination geometry found for the four-coordinate, paramagnetic bromo- and iodo-derivatives in the solid state can best be described as distorted trigonal-bipyramidal with one ligand missing in the trigonal plane. For the chloro derivative, this empty site is occupied in the crystal by a H2O ligand. As 1H NMR studies on the paramagnetic TrpyNiCl reveal an equilibrium exists between the four- and five-coordinate form with solvent, but not a six-coordinate form, and for pyridine-N-oxide as the fifth ligand, thermodn. data of the ligand association could be obtained by a temperature dependent NMR titration study. In the experiment, the researchers used many compounds, for example, 3,5-Dimethylpyridine 1-oxide (cas: 3718-65-8Safety of 3,5-Dimethylpyridine 1-oxide).
3,5-Dimethylpyridine 1-oxide (cas: 3718-65-8) belongs to pyridine derivatives. Pyridines are an important class of heterocycles and occur in polysubstituted forms in many naturally occurring biologically active compounds, drug molecules and chiral ligands. Several pyridine derivatives play important roles in biological systems. While its biosynthesis is not fully understood, nicotinic acid (vitamin B3) occurs in some bacteria, fungi, and mammals.Safety of 3,5-Dimethylpyridine 1-oxide