title: Studies on the interaction of achiral cationic pseudoisocyanine with chiral metal complexes.
abstract: The effect of chiral metal complexes ([Co(en)(3)]I(3)·H(2)O, cis-[CoBr(NH(3))(en)(2)]Br(2), K[Co(edta)]·2H(2)O and [Ru(phen)(3)](PF(6))(2)) on the polymer-bound J-aggregates in aqueous mixtures of pesudoisocyanine (PIC) iodine and poly(acrylic acid, sodium)(PAAS) have been studied by UV-vis absorption, circular dichroism (CD) and fluorescence spectra. At low concentration, the PIC monomers could self-assemble to form supermolecules by binding to each of the COO(-) groups on the polymer chains through electrostatic interactions. After the addition of chiral metal complexes to the formed PIC-PAAS J-aggregates, we found that only the chiral multiple π-conjugated phenanthroline metal complexes could transfer their metal-centered chiral information to the formed J-aggregates. The chiral J-aggregates showed a characteristic induced circular dichroism (ICD) in the visible region of J-band chromophore, and the ICD signals depend on the absolute configuration, concentration of the chiral multiple π-conjugated metal complexes, as well as temperature. More interestingly, the supramolecular chirality of the polymer supported PIC J-aggregates could be memorized even after the addition of an excess opposite chiral complex enantiomers. This is in sharp contrast to the behavior in the high concentrated NaCl induced PIC-J aggregates, in which the optical rotation of a mixture of two enantiomers varies linearly with their ratio.
authors.affiliation: College of Chemistry and Chemical Engineering, Graduate University of Chinese Academy of Sciences, Beijing, China. wangjian06@mails.gucas.ac.cn
authors.forename: Jian
authors.initials: J
authors.lastname: Wang
authors.forename: Lixi
authors.initials: L
authors.lastname: Zeng
authors.forename: Dongdong
authors.initials: D
authors.lastname: Ding
authors.forename: Xiangjun
authors.initials: X
authors.lastname: Li
authors.forename: Hui
authors.initials: H
authors.lastname: Zhang
authors.forename: Hong
authors.initials: H
authors.lastname: Zhao
authors.forename: Jun
authors.initials: J
authors.lastname: Fan
authors.forename: Weiguang
authors.initials: W
authors.lastname: Zhang
authors.forename: Yujian
authors.initials: Y
authors.lastname: He
mesh_terms: D002412:Cations / Q000737:chemistry; D003035:Cobalt / Q000737:chemistry*; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000737:chemistry*; D010316:Particle Size; D011804:Quinolines / Q000737:chemistry*; D012428:Ruthenium / Q000737:chemistry*; D013237:Stereoisomerism; D013499:Surface Properties; D013696:Temperature
chemical_list: D002412:Cations; D009942:Organometallic Compounds; D011804:Quinolines; C100254:pseudoisocyanine; D003035:Cobalt; D012428:Ruthenium