Synthesis and Characterization of Novel Amphiphilic Azo-Polymers Bearing Well-Defined Oligo(Ethylene Glycol) Spacers

García, Tonatiuh; Carreón-Castro, María del Pilar; Gelover-Santiago, Adriana; Ponce, Patricia; Romero, M.; Rivera, Ernesto

doi:10.1163/156855511x615047

Cited by 13 publications

(8 citation statements)

References 27 publications

(37 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Particularly, p-conjugated porphyrin-azobenzene systems showed to be efficient light responsive materials with potential applications in optical storage [22][23][24][25][26][27]. Although our research group has reported the synthesis of characterization of a large series of azobenzene based materials (azo-dyes [28][29][30][31], azo-polymers [32][33][34][35][36] and azo-dendrons [37,38]) porphyrin-azobenzene molecules have attracted our interest since their optical properties can be modified either electrochemically or photochemically [39][40][41]. In addition, these compounds offer great advantages, since they easily absorb light and exhibit different oxidation states.…”

Section: Introductionmentioning

confidence: 99%

Design of novel luminescent porphyrins bearing donor–acceptor groups

Caicedo

Zaragoza-Galán

Crusats

et al. 2014

J. Porphyrins Phthalocyanines

Self Cite

View full text Add to dashboard Cite

In this work, we report the synthesis and characterization of a novel series of porphyrins, some of them bearing donor-acceptor groups. meso-substituted free-base porphyrins:5-(4-aminophenyl)-10,15,20-triphenylporphyrin (TPPNH 2 ) and 5-(4-acetamidophenyl)-10,15,20-triphenylporphyrin (TPPNHAc), as well as their tribromo (Br 3 TPPNH 2 and Br 3 TPPNHAc) and trimethylsilyl-substituted homologs (TMS 3 TPPNH 2 and TMS 3 TPPNHAc) were synthesized and characterized. The optical properties of all compounds have been studied by absorption and fluorescence spectroscopy. Theoretical calculations were performed in order to recognize the optimized geometry and the correlation with the optical properties. On the other hand, an azobenzene containing porphyrin (TPPN 2 PhC 14 H 29 ) was also prepared to study the influence of the trans-cis photoisomerization on its optical properties. Almost all porphyrin derivatives exhibited a Soret band at ca. l = 419-422 nm followed by four Q-bands in the range between 500-700 nm. Besides, these porphyrins showed two emission bands located at ca. l = 654 nm and 714 nm with different intensities, depending on the substituents. The relative quantum yields were calculated for these compounds with respect to the most emissive species.

show abstract

Section: Introductionmentioning

confidence: 99%

Design of novel luminescent porphyrins bearing donor–acceptor groups

Caicedo

Zaragoza-Galán

Crusats

et al. 2014

J. Porphyrins Phthalocyanines

Self Cite

View full text Add to dashboard Cite

show abstract

“…[13][14][15] The investigation on the radical (co)polymerization, [16] radiation-induced bulk polymerization, [17] solution interdiffusion, [18,19] solution properties and kinetics of solution formation in various media, [20] rheological properties, [21] swelling thermodynamics, [22] and thermal degradation and its kinetics and mechanism of the PVT has been reported. Well-known technique for the preparation of the PVT is traditional radical polymerization of 5-vinyltetrazole monomer, [23,24] Considering that the 5-vinyltetrazole monomer is not readily available at the present time because of the absence of commercial source of 5-vinyltetrazole and also the difficulty in the synthesis of the 5-vinyltetrazole, [25][26][27] a new and powerful technique for the preparation of the PVT by tetrazole cyclization of polyacrylonitrile (PAN) could be a real challenge. This paper deals with an efficacious preparation and characterization of the PVT by the tetrazolation of the cyano groups in the PAN, that is, polymer-analogous conversion.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of new nitrogen-rich polymers as candidates for energetic applications

Mahkam

Nabati

Latifpour

et al. 2013

Designed Monomers and Polymers

View full text Add to dashboard Cite

The novel functionality of aromatic tetrazole derivatives with high nitrogen content predetermines a great interest to tetrazole-containing polymers. Poly(5-vinyltetrazole) is one of the most attractive polymers containing tetrazoles. The 4-chloromethyl styrene (CMS) was copolymerized with acrylonitrile (in various mole ratios) by free radical polymerization method at 70°C using α,α-azobis(isobutyronitrile) as an initiator. The reaction azide ion with copolymers, simultaneously with replacement of all the chlorine atoms in CMS units, causes the nitrile groups are entirely converted to tetrazole in dimethylformamide at elevated temperatures. The polymers, obtained in quantitative yields, were characterized by FT-IR and 1 H NMR spectroscopy, differential scanning calorimetry, and gel permeation chromatograph studies. Thermal properties nitrogen-rich polymers show that explosive thermal degradation takes place at around 260°C.

show abstract

“…Further, the synthesis process of graft copolymer is simple and viable. Therefore, design and synthesis of amphiphilic graft copolymers have been a hotspot of the research [20][21][22][23]. As a kind of easily obtainable macromonomer, poly(-ethylene glycol) (PEG) is widely used as hydrophilic side chains for amphiphilic graft copolymers.…”

Section: Introductionmentioning

confidence: 99%

Self-Assembled Glucose and Thermo Dual-Responsive Micelles of an Amphiphilic Graft Copolymer

Zheng

Yang

et al. 2013

International Journal of Polymeric Materials and Polymeric Biom

View full text Add to dashboard Cite

Amphiphilic copolymers P(PBA)-g-P(PEG) containing poly(phenylboronic acid) (PPBA) and poly(ethylene glycol) (PEG) side chains were synthesized by copolymerization of 4-vinylphenylboronic acid (PBA) and poly(ethylene glycol) methyl ether methacrylate. The surface tension results showed that the critical micelle concentration (CMC) of P(PBA)-g-P(PEG) was 0.09 g=L. TEM revealed that these copolymers self-assembled into regular sphere micelles above CMC. The photon correlation spectroscopy suggested that they had unique performance of thermo-induced self-assembly. Above critical micelle temperature, they self-assembled into monodisperse micelles with thermosensitivity. Hydrodynamic diameters of these micelles increased dramatically in the presence of glucose. The glucose-regulated drug release behavior was observed through UV-vis spectroscopy.

show abstract

Synthesis and Characterization of Novel Amphiphilic Azo-Polymers Bearing Well-Defined Oligo(Ethylene Glycol) Spacers

Cited by 13 publications

References 27 publications

Design of novel luminescent porphyrins bearing donor–acceptor groups

Design of novel luminescent porphyrins bearing donor–acceptor groups

Synthesis and characterization of new nitrogen-rich polymers as candidates for energetic applications

Self-Assembled Glucose and Thermo Dual-Responsive Micelles of an Amphiphilic Graft Copolymer

Contact Info

Product

Resources

About