Self-assembled nanowire networks of aryloxy zinc phthalocyanines based on Zn-O coordination.
Tetrakis(aryloxy)phthalocyanine (4c) and its Zn congeners (4a and 4b) and Ni congener (4d) were synthesized, and their self-assembling properties in coordinating and non-coordinating solvents were investigated by absorption and fluorescence spectroscopy, matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS), and transmission electron microscopy (TEM). Compounds 4a and 4b in non-coordinating solvents exhibit red-shifted and split Q-bands in absorption spectra even at very low concentrations, suggesting J-aggregate formation. The MALDI-TOF MS for the samples of 4a and 4b prepared from chloroform solutions gives the monomer and aggregate signals. The TEM images of such samples display an indefinite two-dimensional network structure. The aggregates break up into monomers when a coordinating solvent is added to the solution. The driving force for the aggregate formation is proposed to be the complementary coordination of the ether oxygen in the aryloxy groups of one molecule to the core Zn of another molecule of phthalocyanine.
Huang
Xin
X
Department of Chemistry, Tsinghua University, Beijing 100084, People's Republic of China.
Zhao
Fuqun
F
Li
Zhongyu
Z
Tang
Yingwu
Y
Zhang
Fushi
F
Tung
Chen-Ho
CH
D007211:Indoles / Q000737:chemistry*; D054833:Isoindoles; D046529:Microscopy, Electron, Transmission / Q000379:methods; D015394:Molecular Structure; D053770:Nanowires / Q000737:chemistry*; D009532:Nickel / Q000737:chemistry; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D010100:Oxygen / Q000737:chemistry*; D010316:Particle Size; D012680:Sensitivity and Specificity; D013050:Spectrometry, Fluorescence / Q000379:methods; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization / Q000379:methods; D013056:Spectrophotometry, Ultraviolet / Q000379:methods; D013499:Surface Properties; D015032:Zinc / Q000737:chemistry*
D007211:Indoles; D054833:Isoindoles; D009942:Organometallic Compounds; D009532:Nickel; D015032:Zinc; D010100:Oxygen; C013647:phthalocyanine