Syntheses, crystal structures, optical limiting properties, and DFT calculations of three thiophene-2-aldazine Schiff base derivatives†
Abstract
The syntheses, characterizations and structural determinations of N,N′-bis(thiophenyl-2-methylene)hydrazine 1, N,N′-bis(4-bromothiophenyl-2-methylene)hydrazine 2 and N,N′-bis(5-bromothiophenyl-2-methylene)hydrazine 3 are presented. The materials show third-order nonlinear behaviour with transmissions of 20, 22 and 18 μJ for an input energy of 150 μJ. The 4- and 5-bromothiophenic structures show Br⋯Br interactions of 3.562 and 3.626 Å, respectively. Analysis of bromine containing