Roles of rhenium diimine complexes as metal‐ion probes and photosensitizers in functional polyurethanes

Hui, Ching Sum; Lam, Lillian Sze Man; Yin, Chun Yang; Chan, Wai Kin; Djurišić, Aleksandra B.

doi:10.1002/pola.10715

Cited by 7 publications

(5 citation statements)

References 26 publications

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“…The first peak corresponds to ultrahigh-molecular-weight (>10 7 ) species, while the second peak carries several small shoulders with a calculated number-average molecular weight of 176 000. Such phenomenon was also observed in our previously reported rhenium [8] or ruthenium complex containing polymers. [9] This may be caused by an interaction between the charged polymers and the column materials, or by the formation of aggregates in polymer solution.…”

Section: Resultssupporting

confidence: 64%

Self‐Assembled Monolayer Formed by a Rhenium Complex Containing Hyperbranched Polymer

Tse

Cheng

Chan

et al. 2004

Macromol. Rapid Commun.

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Summary: The synthesis of a hyperbranched polymer containing a rhenium bipyridine complex is reported. The polymer was synthesized from a monomer that contains two chlorotricarbonyl rhenium(I) bipyridine moieties and a stilbazole ligand, and the polymer was formed by the coordination reaction in one single step. Gel permeation chromatography results showed that the resulting polymer had a strong interaction with the column packing material, which was reduced when the eluent was added with an electrolyte. Both atomic force microscopy and laser light scattering showed that the size of the polymer molecules was in the range between 25–30 nm. A monolayer of polymer molecules could form on a pretreated substrate by the self‐assembly process, which can serve as the building block for multilayer ultrathin film devices.The metal‐containing hyperbranched polymer synthesized here.magnified imageThe metal‐containing hyperbranched polymer synthesized here.

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Section: Resultssupporting

confidence: 64%

Self‐Assembled Monolayer Formed by a Rhenium Complex Containing Hyperbranched Polymer

Tse

Cheng

Chan

et al. 2004

Macromol. Rapid Commun.

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“…Those samples doped with TPA had primary yields one order of magnitude higher than that of the undoped sample, and this indicated the active role of TPA in the excitation process. On the other hand, their thermalization distances were very similar to those of other rhenium complexes70 and rhenium‐containing polymers 74. This suggested that the values of the initial separation distance were largely dependent on the rhenium center.…”

Section: Resultssupporting

confidence: 60%

Synthesis and characterization of random and block copolymers with pendant rhenium diimine complexes by controlled radical polymerization

Tse

Lam

Man

et al. 2005

J. Polym. Sci. A Polym. Chem.

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We report the polymerization of rhenium-containing methacrylates by atom transfer radical polymerization. The structure of the monomer was confirmed by X-ray crystallography, which showed the bulkiness of the metal-complex moiety. The rhenium complexes were polymerized in the presence of copper(I) bromide, 1,1,4,7,7-pentamethyldiethylenetriamine, and methyl 2-bromopropionate. They were copolymerized with methyl methacrylate in different monomer ratios. An ABA triblock copolymer was also synthesized with poly(methyl methacrylate) as the macroinitiator. When 2,2Ј-bipyridine was used as the ligand for the copper catalyst in the polymerizations, it underwent a ligand exchange process with the iminopyridine ligand in the monomer. The neutral rhenium complex in the homopolymers and copolymers could be converted into ionic forms by the replacement of the chloride with an imidazole ligand, and the solubility of the resulting ionic polymers was greatly enhanced. The photosensitizing properties of the doped and undoped polymer films were investigated by the measurement of the photocurrent response under an externally applied electric field. The photoconductivities of the polymers were approximately 10 Ϫ12 -10 Ϫ13 ⍀ Ϫ1 cm Ϫ1 . The experimental quantum efficiencies were simulated with Onsager's theory, and they showed that the initial quantum yield and thermalization distance were 10 Ϫ3 and 1.7 nm, respectively. Transmission electron microscopy showed that the rhenium complexes aggregated to form domains with dimensions of approximately 20 -30 nm.

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“…[177][178][179][180][181][182] Rhenium(I) diimine complexes have been incorporated into polymeric structures based on polystyrene, 183 poly(methyl methacrylate), 183 poly(p-phenylenevinylene) 20,23,184 and polyurethane. 185 However, only a few articles deal with the structure-property relationships of conjugated Re(I)-containing polymers. 23,186,187 Schanze et al selected, as targets, a series of oligo(arylene ethynylene)s (OAEs) that contained a central 2,2 0 -bipyridine metal chelating unit.…”

Section: Macromolecules Containing Pyridine-based Re(i) Complexesmentioning

confidence: 99%

Photogenerated avenues in macromolecules containing Re(i), Ru(ii), Os(ii), and Ir(iii) metal complexes of pyridine-based ligands

et al. 2012

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Pyridine-based ligands, such as 2,2'-bipyridine and 1,10-phenanthroline, have gained much interest in the fields of supramolecular chemistry as well as materials science. The appealing optoelectronic properties of their complexes with heavy d(6) transition metal ions, such as Ru(ii), Os(II), Re(I) and Ir(III), primarily based on the metal-to-ligand charge-transfer (MLCT) nature featuring access to charge-separated states, have provided the starting point for many studies in the field of dye-sensitized solar cells (DSSCs), organic light emitting diodes (OLEDs), artificial photosynthesis and photogenerated electron as well as energy transfer processes. This critical review provides a comprehensive survey over central advances in the field of soluble metal-containing macromolecules in the last few decades. The synthesis and properties of functionalized 2,2'-bipyridyine- and 1,10-phenanthroline-based d(6) metal complexes, in particular, their introduction into different prevailing polymeric structures are highlighted. In the most part of the review metal complexes which have been attached as pendant groups on the polymer side chain are covered. Selected applications of the herein discussed metal-containing macromolecules are addressed, particularly, with respect to photogenerated electron/energy transfer processes. In order to enable a deeper understanding of the properties of the ligands and metal complexes, the fundamentals of selected photophysical processes will be discussed (223 references).

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Roles of rhenium diimine complexes as metal‐ion probes and photosensitizers in functional polyurethanes

Cited by 7 publications

References 26 publications

Self‐Assembled Monolayer Formed by a Rhenium Complex Containing Hyperbranched Polymer

Self‐Assembled Monolayer Formed by a Rhenium Complex Containing Hyperbranched Polymer

Synthesis and characterization of random and block copolymers with pendant rhenium diimine complexes by controlled radical polymerization

Photogenerated avenues in macromolecules containing Re(i), Ru(ii), Os(ii), and Ir(iii) metal complexes of pyridine-based ligands

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