INVESTIGATION ON THE FLUORESCENT PROPERTY AND THE HIRSHFELD SURFACE ANALYSIS OF A NOVEL HETEROBIMETALLIC Cd(II)—Na(I) PYRIDINE-TERMINAL SALAMO-TYPE COORDINATION POLYMER

A novel heterometallic Cd(II)–Na(I) coordination polymer (Cd(II)–Na(I) CP), [{Cd(H2L)(OAc)(μ2-OAc)Na(OAc)(MeOH)(EtOH)}2]n is self-assembled via a reaction between Cd(OAc)2·H2O, NaN(CN)2, and a salamo-type ligand H2L containing terminal pyridine. It is structurally characterized. There are two kinds of metal atoms with different coordination modes. The N2O2 cavity of H2L is not involved in coordination, while the terminal pyridine nitrogen atoms are linked to Cd(II) atoms. Two kinds of acetate groups (OAc– and μ2-OAc–) are coordinated with Cd(II) atoms in different coordination modes; two identical Cd(II) atoms are bridged by oxygen atoms of μ2-OAc– groups. The Na(I) atoms are linked to Cd(II) atoms via one oxygen atom of μ2-OAc–; one acetate group (OAc–), one undeprotonated methanol and ethanol molecules are also coordinated with Na(I) atoms. With Cd(II) atoms as the node and the undeprotonated H2L ligand molecule as the linker, a coordination polymer with a larger pore size (25.04·17.66(2) A2) is formed. Cd(II)–Na(I) CP can emit brighter green fluorescence, hence, it can be applied to the development of fluorescent materials. Various short-range interactions on the Cd(II)–Na(I) CP surface are studied by the Hirshfeld surface analysis.