Highly fluorescent aryl-cyclopentadienyl ligands and their tetra-nuclear mixed metallic potassium–dysprosium clusters

Alkyl substituted triaryl-cyclopentadienyl ligands with aggregation-induced emission enhancement (AIEE) properties and their applications in the syntheses of novel chloride bridged tetra-nuclear mixed potassium–dysprosium metallocenes.

Preparation and Structure of Lithium Bis[cis-ethene-l,2-di(tbutylamido)]gallate(III) Tetrahydrofuran

The dilithium diamide reagent obtained from N,N′-di(tbutyl)-1,4-diazabutadiene and two equivalents of lithium metal reacts with anhydrous gallium trichloride in tetrahydrofuran / hexane, followed by treatment with metallic potassium, to give the title compound in about 40% yield. Cyclic imides of gallium(III) and gallium(II) are by-products of this process. The structure of Li{[cis-C2H2(NtBu)2]2Ga} has been determined from single crystals containing one mole equivalent of tetrahydrofuran. The gallium atom is chelated by two diamide ligands. One of the five-membered chelate rings is planar while the second one is folded at its nitrogen atoms. The lithium atom is η4 -coordinated to the 1,4-diazabutene(2) unit of this ring and further to the oxygen atom of the solvent molecule.