47 research outputs found
Synthesis of Two New Group 13 Benzoato-Chloro Complexes: A Structural Study of Gallium and Indium Chelating Carboxylates
Two new heteroleptic chelated-benzoato gallium (III) and indium (III) complexes have been prepared and structurally characterized. The molecular structures of [GaCl2(4-Mepy)2(O2CPh)]4-Mepy (1) and [InCl(4-Mepy)2(O2CPh)2]4-Mepy (2) have been determined by single-crystal x-ray diffraction. The gallium compound (1) is a distorted octahedron with cis-chloride ligands co-planar with the chelating benzoate and the 4-methylpyridines trans to each other. This is the first example of a Ga(III) structure with a chelating benzoate. The indium compound (2) is a distorted pentagonal bipyramid with two chelating benzoates, one 4-methylpyridine in the plane and a chloride trans to the other 4-methylpyridine. The indium bis-benzoate is an unusual example of a seven-coordinate structure with classical ligands. Both complexes, which due to the chelates, could also be described as pseudo-trigonal bipyramidal, include a three-bladed motif with three roughly parallel aromatic rings that along with a solvent of crystallization and electron-withdrawing chloride ligand(s) stabilize the solid-state structures
Controlling the Emissive Activity in Heterocyclic Systems Bearing Cî—»P Bonds
The
photophysical properties of a series of heteroatom substituted
indoles are explored to identify chemical means to control their emissive
activity. In particular, we consider impacts of changes in the conjugated
backbone, where the Cî—»N bonds of benzoxazoles are replaced
by Cî—»P bonds (benzoxaphospholes). The effects of extending
the π-conjugation, incorporating various secondary heteroatoms
(X–CP), and enforcing planar rigidity are also examined.
Our computational analysis explains the higher fluorescence efficiency
observed with extended π-conjugation and highlights the importance
of maintaining molecular planarity at both ground- and emissive-state
geometries