A strongly fluorescent NiII complex with 2-(2-hydroxyethyl)pyridine ligands: synthesis, characterization and theoretical analysis and comparison with a related polymeric CuII complex

Acta Crystallographica Section E: Crystallographic Communications

Mohamed AbdEsselem Dems¹  Seifeddine Sellami²  Jean Claude Daran³  Ouahida Zeghouan⁴  Hocine Merazig⁴ 

[1] Centre de Recherche en Biotechnologie, Constantine, Algeria;Laboratoire Pollution et Traitement des Eaux, Département de Chimie, Faculté des Sciences Exactes, Université Frères Mentouri Constantine 1, 25000 Constantine, Algeria;Laboratoire de Chimie de Coordination, UPR-CNRS 8241, 205 route de Narbonne, 31077 Toulouse Cedex 4, France;Unité de Recherche Chimie de l'Environnement et Moléculaire Structurale, 'CHEMS', Faculté des Sciences Exactes, Campus Chaabet Ersas, Université Frères Mentouri Constantine 1, 25000 Constantine, Algeria;

关键词: transition metal;    fluorescence;    blue-light emission;    TDDFT;    crystal structure;   

DOI  :  10.1107/S2056989018009301

来源: DOAJ

【 摘 要 】

The synthesis and characterization of diaquabis[2-(2-hydroxyethyl)pyridine-κ2N,O)nickel(II) dinitrate, [Ni(C7H9NO)2(H2O)2](NO3)2, under ambient conditions is reported and compared with catena-poly[[bis[2-(2-hydroxyethyl)pyridine-κ2N,O]copper(II)]-μ-sulfato-κ2O:O′], [Cu(C7H9NO)2(SO4)]n [Zeghouan et al. (2016). Private communication (refcode 1481676). CCDC, Cambridge, England]. In the two complexes, the 2-(2-hydroxyethyl)pyridine ligands coordinate the metal ions through the N atom of the pyridine ring and the O atom of the hydroxy group, creating a chelate ring. The NiII or CuII ion lies on an inversion centre and exhibits a slightly distorted MO4N2 octahedral coordination geometry, build up by O and N atoms from two 2-(2-hydroxyethyl)pyridine ligands and two water molecules or two O atoms belonging to sulfate anions. The sulfate anion bridges the CuII ions, forming a polymeric chain. The photoluminescence properties of these complexes have been studied on as-synthesized samples and reveal that both compounds display a strong blue-light emission with maxima around 497 nm. From DFT/TDDFT studies, the blue emission appears to be derived from the ligand-to-metal charge-transfer (LMCT) excited state. In addition, the IR spectroscopic properties and thermogravimetric behaviours of both complexes have been investigated.

【 授权许可】

Unknown