Self-assembled Nano-Structures of Sandwich-type Mixed (Phthalocyaninato)(porphyrinato) Rear Earth complexes. Effect of porphyrin-phthalocyanine ligands on Tuning the Inter-molecular Interaction
Three novel sandwich-type mixed (phthalocyaninato)(porphyrinato) rear earth complexes, namely Ce(DPP)(Pc)(1), Sm2(DPP)(Pc)2(2) and Sm2(DPP)2(Pc)(3) Pc = dianion of phthalocyanine, DPP= dianion of 5,15-di(phenyl)porphyrin, have been fabricated into nano-assemblies onto the SiO2 surface by a surface assisted solvent-vapor annealing method. The effect of the number of porphyrin and phthalocyanine ligands on the morphology of self-assembled nanostructures of these double- and triple-decker complexes has been systematically studied. Competition and cooperation between the inter-molecular π-π interaction, van der Waals, and metal-ligand coordination for different compounds results in nanostructures with different morphology from approximately spherical shape with average size of ～300 nm and ～400 nm for 1 and 2, respectively, nano-rods with aspect ratio (length over width) around 5 for 3, which were characterized by electronic absorption, X-ray diffraction (XRD), and atomic force microscopy (AFM). Electronic absorption spectroscopic results reveal the formation of J-aggregates in the nano-structures and suggest the increasing π-π interaction in the order of 3, 1, to 2. Examination by XRD reveal that in the nanostructures of compounds 1-3, a dimeric supramolecular structure was formed through an intermolecular π-π interaction and/or van der Waals between two sandwich-type molecules, which as the building block self-assembles into the target nanostructures.
phthalocyanine porphyrin sandwich rare earth complex nanostructure self-assembly
Lina Chen Yanli Chen Peihua Zhu Guoxin Sun Hongyan Wang Jianzhuang Jiang
School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China Department of Chemistry, University of Science and Technology Beijing, Beijing 100083, China
国际会议
青岛
英文
341-344
2009-10-09（万方平台首次上网日期，不代表论文的发表时间）