A novel class of oligomeric and polymeric d(10) metal complexes of asymmetrical N-heterocyclic ligand with strong pi-stacking and hydrogen bonding: syntheses, structures, and photoluminescence

作者：Wang Jing lin; Liu Bin; Yang Bin sheng^*

来源：CrystEngComm, 2011, 13(23): 7086-7097.

DOI：10.1039/c1ce05890h

A novel asymmetric N-heterocyclic ligand, 1 center dot H2O [1 = (E)-1-methyl-4-nitro-N'-(pyridin-2-ylmethylene)-1H-pyrrole-2-carbohydrazide], was generated by a facile route, and some closed shell metal complexes of the ligand were also synthesized. These complexes include [Zn(1)Cl-2] (2), [Cd(1) (mu-Cl)(2)](n) (3), [Hg(1)Cl-2] (4) and [K(mu-1)(mu-NO3)](n) (5), which were characterized by X-ray crystallography, IR and H-1-NMR spectroscopy, and elemental analyses. The structural studies indicate that ligand 1, with its different conformations and new coordination modes, is an important building block for designing and constructing supramolecular structures via pi center dot center dot center dot pi stacking, hydrogen bonding, Cl center dot center dot center dot Cl and d(10)-d(10) interactions. These interactions not only reinforce the stability of structures, but also correlate with the physical properties of complexes. The UV and fluorescence spectral properties were investigated in solution. The titration experiments by d(10) metal ions imply that ligand 1 forms stable complexes at a 1 : 1 ratio and exhibits enhanced fluorescence. Moreover, compared with the solution fluorescence spectra, the solid-state spectra show more significant red-shifts, suggesting that complexes 2-4 have possible applications as light emission materials.

• 出版日期2011
• 单位山西大学