Ni^II, Pd^II Complexes with Pyrene‐based Thiosemicarbazones: Syntheses, Molecular Structures, and Excimeric Emissions

Abstract

A series of Ni II and Pd II complexes with pyrene-based thiosemicarbazones were conveniently prepared. The crystal structures of Ni(L 2 ) 2 , Pd(L 1 ) 2 , and Pd(L 2 ) 2 were determined. X-ray crystallographic analysis reveals that the complexes are of mononuclear struc-* Dr. T.-H. Dinh 113 ture with two pyrenyl rings cofacially aligned. The photoluminescence spectra of the complexes exhibit moderate characteristic excimeric emissions arising from intramolecular π-π stacking between pyrenyl rings.

A Pyrene‐based Probe for Antimony with Special Excimer Fluorescence

“…When the concentration of pyrene solution was high, the excited pyrene fluorogens will pack with each other and emit fluorescence at about 460 nm, which is referred to the pyrene excimers. Similar phenomenon can be observed when pyrene‐based compound is added in the mixture of its solvent and non‐solvent with suitable fraction, which can force the aggregation of compounds and give a hand to the formation of pyrene excimers , . The formation of pyrene excimers will be influenced by lots of factors, such as the concentration of pyrene molecules in the system, the interaction between the pyrene fluorogens, the steric configuration of the pyrene‐based molecules and so on , .…”

Synthesis and Spectroscopic Characterizations of Ni(II) Thiosemicarbazone Bearing Anthracene

“…Indeed, weak interactions such as π-π stackings among the thiosemicarbazone ligands are needed to sustain the cis arrangements [4,5]. Our group also reported anthracene-based and pyrenebased Ni(II) thiosemicarbazone complexes which showed cis geometries cemented by intramolecular π-π interactions [6,7]. In this paper, a new Ni(II) complex with anthracenebased thiosemicarbazone (NiL) is presented.…”