Two new lead(II) coordination polymer and discrete complex containing bipyridine ligands with different positioned methyl substituents: synthesis, characterization, crystal structure determination, and luminescent properties

Abstract

Lead(II) coordination polymer [Pb(5,5 0 -dmbpy) (l-NO 3 ) 2 ] n (1) and mononuclear complex [Pb(6,6 0 -dmbpy) (NO 3 ) 2 ] (2) (where 5,5 0 -dmbpy is 5,5 0 -dimethyl-2,2 0 -bipyridine and 6,6 0 -dmbpy is 6,6 0 -dimethyl-2,2 0 -bipyridine) were synthesized from reaction of lead(II) nitrate with 5,5 0 -dmbpy and 6,6 0 -dmbpy, respectively. Both complexes were thoroughly characterized by elemental analysis, infrared, 1 H and 13 C NMR, UV-Vis, emission spectroscopy, as well as single-crystal X-ray diffraction. Polymer 1 possesses one-dimensional (1D) chain structure, whilst complex 2 exhibits a discrete complex which provide an extended chain parallel to the [001] direction, via weak intermolecular C-HÁÁÁO hydrogen bonding. Coordination number of Pb 2? in 1 and 2 are 8 and 6, respectively, with the stereochemically active lone pair, resulting in the hemidirected geometry for both complexes. The nitrate anions exhibit a tridentate chelating/bridging mode in 1, and a bi-chelating mode in 2. The supramolecular features in these complexes are guided/influenced by weak directional intermolecular C-HÁÁÁO hydrogen bonding (1 and 2) together with p-p and C-HÁÁÁp (1) interactions. The luminescence studies of 1 and 2 confirmed that the position of methyl substituent on 2,2 0 -bipyridine rings has a profound effect on the fluorescence emissions.

Synthesis, Characterization and Crystal Structure Determination of a New Indium (III) Complex: [In(5,5’-DiMeBiPy)Cl3(DMSO)].2(DMSO)

“…[28][29][30][31][32] . In addition, two strong signals at 1050 and 944 cm -1 has been assigned to n(S=O) for free and coordinated DMSO, respectively [33][34][35] .…”

“…The UV-Vis spectrum of the DMSO solution of 1 have band at 295 nm which can be assigned to the π→π* transition 31 . NMR spectroscopy studies were conducted to characterize the chemical structure of The colorless prismatic crystals of [In(5,5'-DiMeBiPy)Cl 3 (DMSO)].2(DMSO) were grown by slow evaporation of DMSO solution during three weeks.…”

Nickel(ii) Complex Containing 5,5'-Dimethyl-2,2'-Bipyridine: Crystal Structure and Luminescent Properties

“…The nickel(II) complexes with N donor ligands are interest owing to their importance for catalysts [ 9,10 ]. 5,5c-Dimethyl-2,2c-bipyridine (5,5c-dmbipy) is a good bidentate ligand, and numerous complexes have been prepared with it, such as those of iron [ 11 ], platinum [ 12 ], vanadium [ 13 ], lead [ 14 ], mercury [ 15 ], gold [ 16 ], cadmium [ 17 ], zinc [ 18 ], indium [ 19 ], thallium [ 20 ] and rhenium [ 21 ]. We report herein the synthesis, characterization and crystal structure of a new nickel (II) complex with chloride and 5,5c-dimethyl-2,2c-bipyridine.…”