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The synthesis and characterization of di-aqua-bis-[2-(2-hy-droxy-eth-yl)pyridine-κ 2  N , O )nickel(II) dinitrate, [Ni(C 7 H 9 NO) 2 (H 2 O) 2 ](NO 3 ) 2 , under ambient conditions is reported and compared with catena -poly[[bis-[2-(2-hy-droxy-eth-yl)pyridine-κ 2  N , O ]copper(II)]-μ-sulfato-κ 2  O : O '], [Cu(C 7 H 9 NO) 2 (SO 4 )]  n  [Zegh-ouan et al. (2016 ▸). Private communication (refcode 1481676). CCDC, Cambridge, England]. In the two complexes, the 2-(2-hy-droxy-eth-yl)pyridine ligands coordinate the metal ions through the N atom of the pyridine ring and the O atom of the hy-droxy group, creating a chelate ring. The Ni II or Cu II ion lies on an inversion centre and exhibits a slightly distorted M O 4 N 2 octa-hedral coordination geometry, build up by O and N atoms from two 2-(2-hy-droxy-eth-yl)pyridine ligands and two water mol-ecules or two O atoms belonging to sulfate anions. The sulfate anion bridges the Cu II 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.

acta crystallographica. section e, crystallographic communications

A strongly fluorescent Ni<sup>II</sup> complex with 2-(2-hydroxyethyl)pyridine ligands: synthesis, characterization and theoretical analysis and comparison with a related polymeric Cu<sup>II</sup> complex

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

A strongly fluorescent Ni^II complex with 2-(2-hydroxyethyl)pyridine ligands: synthesis, characterization and theoretical analysis and comparison with a related polymeric Cu^II complex