Self-assembled zinc(ii) Schiff base polymers for applications in polymer light-emitting devices

Kwok, Chi‐Chung; Yu, Sze-Chit; Sham, Iona H. T.; Che, Chi‐Ming

doi:10.1039/b412762e

Cited by 58 publications

(10 citation statements)

References 12 publications

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“…Polymers P1 − P3 were fabricated into four-layer PLED devices, respectively, with a configuration of ITO/PEDOT:PSS(40−50 nm)/polymer ( P1 − P3 ) (50−60 nm)/BCP(10 nm)/Alq 3 (30 nm)/LiF(1 nm)/Al(150 nm) using standard procedures of spin-coating and vacuum deposition methods, where polymers P1 − P3 were used as the emission layer and PEDOT: PSS as the hole transporter. Besides, either BCP or ALQ was used as an electron transporter 19c. The EL properties are listed in Table .…”

Section: Resultsmentioning

confidence: 99%

Novel Self-Assembled Metallo-Homopolymers and Metallo-alt-copolymer Containing Terpyridyl Zinc(II) Moieties

2006

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A series of novel terpyridyl Zn(II))-based metallo-polymers, including metallo-homopolymers and metallo-alt-copolymer, containing carbazole pendants attached to the C-9 position of fluorene by long alkyl spacers were constructed by self-assembled reaction. The integrated ratios of 1H NMR reveal a facile result to distinguish the differences between metallo-homopolymers and copolymers. To further investigate these polymers, UV−vis and PL spectral titration experiments were also carried out by varying the molar ratios of zinc(II) ions to monomers. The photophysical properties of these polymers exhibited blue PL emissions (around 420 nm) with quantum yields of 11−23% (in DMF) and the PL results revealed that the formation of excimers were suppressed by the incorporation of carbazole pendant groups. In addition, the EL results showed green EL emissions (around 550 nm) with turn-on voltages of 6.0−6.5 V, maximum efficiencies of 0.85−1.1 cd A-1 (at 100 mA cm-2), and maximum luminances of 1704−2819 cd/m2 (around 15 V), correspondingly.

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Section: Resultsmentioning

confidence: 99%

Novel Self-Assembled Metallo-Homopolymers and Metallo-alt-copolymer Containing Terpyridyl Zinc(II) Moieties

2006

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“…16, H 5.42, N, 11.89; found for 1Z, 1E: C 78. 13, 78.10, H 5.49, 5.50, N 11.70, 11.68 4,111.0,111.9,112.2,122.7,127.0,130.4,134.8,136.0,142.6,155.4,162.9 (N=CH) 21.0,104.5,110.9,111.2,111.8,125.3,126.9,130.4,134.6,135.9,142.7,155.1,162.4 (N=CH) A mixture of 2-hydroxy-4-(di-p-tolylamino)benzaldehyde (635 mg, 2.0 mmol), ZnA C H T U N G T R E N N U N G (OAc) 2 ·2H 2 O (327 mg, 1.5 mmol) and diaminomaleonitrile (108 mg, 1.0 mmol) was stirred in MeOH/THF (10 mL/20 mL) overnight at room temperature. Then the solvent was removed under vacuum.…”

Section: Methodsmentioning

confidence: 98%

“…[4] Of particular interest are salen ligands functionalized by an electron-donor (D)/electron-acceptor (A) pair having intramolecular charge-transfer (ICT) properties, such that the associated complexes may have nonlinear optical (NLO) properties. [5,6] To enhance the strength of ICT, the salen ligands are generally anchored by a strongly electron withdrawing moiety such as a cyano group (A) on diamines and dialkylamino substituents (D) at the conjugated position of the diamines.…”

Section: Introductionmentioning

confidence: 99%

Photoisomerization of a Maleonitrile‐Type Salen Schiff Base and Its Application in Fine‐Tuning Infinite Coordination Polymers

Lin

Chou

Liao

et al. 2010

Chemistry A European J

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Strategically designed salen ligand 2,3-bis[4-(di-p-tolylamino)-2-hydroxybenzylideneamino]maleonitrile (1), which has pronounced excited-state charge-transfer properties, shows a previously unrecognized form of photoisomerization. On electronic excitation (denoted by an asterisk), 1Z*-->1E isomerization takes place by rotation about the C2--C3 bond, which takes on single-bond character due to the charge-transfer reaction. The isomerization takes place nonadiabatically from the excited-state (1Z) to the ground-state (1E) potential-energy surface in the singlet manifold; 1Z and 1E are neither thermally inconvertible at ambient temperature (25-30 degrees C), nor does photoinduced reverse 1E*-->1Z (or 1Z*) isomerization occur. Isomers 1Z and 1E show very different coordination chemistry towards a Zn(II) precursor. More prominent coordination chemistry is evidenced by a derivative of 1 bearing a carboxyl group, namely, N,N'-dicyanoethenebis(salicylideneimine)dicarboxylic acid (2). Applying 2Z and its photoinduced isomer 2E as building blocks, we then demonstrate remarkable differences in morphology (sphere- and needlelike nanostructure, respectively) of their infinite coordination polymers with Zn(II).

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“…Unsymmetrical Schiff base complexes, where the metal atom is in an unsymmetrical ligand environment play an important role in many biological systems [20]. These compounds may be used as catalysts for various organic transformations, as promising materials for optoelectronic applications [21][22][23]. They can potentially serve as photoactive materials [4].…”

Section: Introductionmentioning

confidence: 99%

Potansiyel Antimikrobiyal Ajanlar Olarak Yeni Asimetrik Schiff Bazlarının Sentezi

Nartop

Öğütçü

2020

Sinop Üniversitesi Fen Bilimleri Dergisi

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New unsymmetrical Schiff bases (L3a-L3c) were synthesized by using a two-stage method. The starting Schiff bases were prepared by the reaction of 2-aminophenol (or 2amino-4-methylphenol or 2-amino-4-chlorophenol) with 1-nitro-2-naphthaldehyde. In these compounds, the nitro groups were reduced to amino groups using selective reducing agent and then 2-hydroxybenzaldehyde were added. Thus, three new unsymmetric Schiff base ligands were obtained. The antimicrobial activity of the synthesized unsymmetric Schiff bases were evaluated against some pathogenic strains (Shigella dysenteria type 7, Listeria monocytogenes 4b, Escherichia coli, Salmonella typhi H, Staphylococcus epidermis, Brucella abortus, Micrococcus luteus, Bacillus cereus sp., Pseudomonas putida sp.) and yeast (Candida albicans).

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Self-assembled zinc(ii) Schiff base polymers for applications in polymer light-emitting devices

Cited by 58 publications

References 12 publications

Novel Self-Assembled Metallo-Homopolymers and Metallo-alt-copolymer Containing Terpyridyl Zinc(II) Moieties

Novel Self-Assembled Metallo-Homopolymers and Metallo-alt-copolymer Containing Terpyridyl Zinc(II) Moieties

Photoisomerization of a Maleonitrile‐Type Salen Schiff Base and Its Application in Fine‐Tuning Infinite Coordination Polymers

Potansiyel Antimikrobiyal Ajanlar Olarak Yeni Asimetrik Schiff Bazlarının Sentezi

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