Sorption of amines by the Langmuir-Blodgett films of soluble cobalt phthalocyanines: evidence for the supramolecular mechanisms.
By means of microgravimetry, UV-Vis spectroscopy and optic microscopy, sorption of pyridine, primary aliphatic amines and benzylamine by the Langmuir-Blodgett (LB) films of tetra-4-tert-butyl- and tetra-(3-nitro-5-tert-butyl)-substituted cobalt phthalocyanines (CoPc' and CoPc*, respectively) was studied over a broad concentration range. In general, sorption occurs as stepwise intercalation of the sorbate molecules into the supramolecular 3D structure of the phthalocyanine assembly followed by formation of the donor-acceptor complexes. Both intercalation depth and stoichiometry of the complexes are determined by the molecular structure of amines. The supramolecular factor allows discrimination between amines in air but not in aqueous solutions because of concurrent intercalation of water.
Valkova
L
L
Ivanovo State University, Lab. of liq. cryst.,189-36, Gen. Khlebnikov St., 153048 Ivanovo, Russia; INFM, Ancona, Italy. valkova@ivanovo.ac.ru
Borovkov
N
N
Koifman
O
O
Kutepov
A
A
Berzina
T
T
Fontana
M
M
Rella
R
R
Valli
L
L
D000327:Adsorption; D001672:Biocompatible Materials / Q000737:chemistry; D007211:Indoles / Q000737:chemistry*; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008567:Membranes, Artificial; D008968:Molecular Conformation; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure; D009942:Organometallic Compounds / Q000737:chemistry*; D010316:Particle Size; D012995:Solubility
D001672:Biocompatible Materials; D007211:Indoles; D046911:Macromolecular Substances; D008567:Membranes, Artificial; D009942:Organometallic Compounds; C063633:cobalt phthalocyanine