Structure and photoluminescence of Zn(II) and Сd(II) complexes with chiral bis-pyridine containing fragments of natural (–)-α-pinene

Complexes ZnLCl 2 ( I ) and [CdLCl 2 ] n ( IV ), where L is chiral bis-pyridine containing fragments of natural monoterpenoide (–)-α-pinene are synthesized. Single crystals of [ZnLCl 2 ]·CH 2 Cl 2 ( II ), [ZnLCl 2 ]· i -PrOH ( III ), and IV compounds are grown. The crystal structures of II and III are composed of mononuclear ZnLCl 2 complex molecules and solvate CH 2 Cl 2 and i -PrOH molecules; the coordination polyhedron of the zinc atom Cl 2 N 2 is a distorted tetrahedron. According to the single crystal XRD data, complex IV is a 1D coordination polymer; the coordination core CdN 2 Cl 4 is a distorted octahedron and Cl atoms are bridging ligands. In the structures of II , III , and IV the L molecule functions as a bidentate chelate ligand. In the solid phase, complexes I and IV exhibit photoluminescence in the visible range (λ max 505 nm and 460 nm respectively). The band intensity in the photoluminescence spectra of I and IV complexes considerably exceeds the band intensity in the spectrum of free L.