Four rare structurally characterized hetero-pentanuclear [Zn4Ln] bis(salamo)-type complexes: syntheses, crystal structures and spectroscopic properties

摘要

Four new hetero-pentanuclear 3d–4f complexes [Zn _(4) (L) _(2) La(NO _(3) ) _(2) (OEt)(H _(2) O)] ( 1 ), [Zn _(4) (L) _(2) Ce(NO _(3) ) _(2) (OMe)(MeOH)] ( 2 ), [Zn _(4) (L) _(2) Pr(NO _(3) ) _(2) (OEt)(EtOH)] ( 3 ) and [Zn _(4) (L) _(2) Nd(NO _(3) ) _(2) (OMe)(MeOH)] ( 4 ) were synthesized by the reactions of a newly synthesized octadentate bis(salamo)-based tetraoxime ligand (H _(4) L) with Zn(OAc) _(2) ·2H _(2) O and Ln(NO _(3) ) _(3) ·6H _(2) O (Ln = La, Ce, Pr and Nd), respectively, and characterized via elemental analyses, FT-IR, UV-Vis spectroscopy and single crystal X-ray crystallography. The X-ray crystallographic investigation revealed that all Zn ~(II) ions were located in N _(2) O _(3) coordination spheres, and possessed a trigonal bipyramid coordination environment. The Ln ~(III) ion lay in an O _(8) coordination sphere, and adopted a distorted square antiprismatic coordination environment. Furthermore, supramolecular interactions and fluorescence properties were investigated.