Chengy G

James R Gardinier, Rosalice M Silva, Chengeto Gwengo, Sergey V Lindeman
The Janus scorpionate ligand, tris(mercaptothiadiazolyl)borate, exhibits extraordinary coordination capacity and versatility, binding from two up to five metal cations as demonstrated by its thallium(i) salt, a compound that serves as a model for metal-surface binding.

Tyler J Morin, Sarath Wanniarachchi, Chengeto Gwengo
A series of iron(II) chloride complexes of pentadentate ligands related to
a,a,a¢,a¢-tetra(pyrazolyl)-2,6-lutidine, pz4lut, has been prepared to evaluate whether pyrazolyl substitution has any systematic impact on the electronic properties of the complexes. For this purpose, the new tetrakis(3,4,5-trimethylpyrazolyl)lutidine ligand, pz**4lut, was prepared via a CoCl2-catalyzed
rearrangement reaction. The equimolar combination of ligand and FeCl2 in methanol gives the appropriate 1 : 1 complexes [FeCl(pzR4lut)]Cl that are each isolated in the solid state as a hygroscopic solvate. In solution, the iron(II) complexes have been fully characterized by several spectroscopic
methods and cyclic voltammetry. In the solid state, the complexes have been characterized by X-ray diffraction, and, in some cases, by Mossbauer spectroscopy. The Mossbauer studies show that the complexes remain high spin to 4 K and exclude spin-state changes as the cause of the surprising
solid-state thermochromic properties of the complexes. Non-intuitive results of spectroscopic and structural studies showed that methyl substitution at the 3- and 5- positions of the pyrazolyl rings reduces the ligand field strength through steric effects whereas methyl substitution at the 4-position of the pyrazolyl rings increases the ligand field strength through inductive effects.