Absorption and Fluorescence Emission Investigations on Supramolecular Assemblies of Tetrakis-(4-sulfonatophenyl)porphyrin and Graphene Quantum Dots

被引：1

作者：

Sara, Mariachiara ^{[1
]}

Giofre, Salvatore Vincenzo ^{[1
]}

Abate, Salvatore ^{[1
]}

Trapani, Mariachiara ^{[2
]}

Verduci, Rosaria ^{[3
]}

D'Angelo, Giovanna ^{[3
]}

Castriciano, Maria Angela ^{[1
]}

Romeo, Andrea ^{[1
,2
]}

Neri, Giovanni ^{[4
]}

Scolaro, Luigi Monsu ^{[1
,2
]}

机构：

[1] Univ Messina, Dipartimento Sci Chim Biol Farmaceut & Ambientali, Vle F Stagno DAlcontres 31, I-98166 Messina, Italy

[2] Univ Messina, ISMN Ist Studio Materiali Nanostrutturati c, ISMN Ist Studio Mat Nanostrutturati, Dipartimento Sci Chim Biol Farmaceut & Ambientali, Vle F Stagno DAlcontres 31, I-98166 Messina, Italy

[3] Univ Messina, Dipartimento Sci Matemat & Informat Sci Fis & Sci, Vle F Stagno DAlcontres 31, I-98166 Messina, Italy

[4] Univ Messina, Dipartimento Ingn, I-98158 Messina, Italy

来源：

MOLECULES | 2024年 / 29卷 / 09期

关键词：

porphyrins; graphene quantum dots; supramolecular adducts; fluorescence emission; CARBON NANODOTS; PORPHYRIN; AGGREGATION; KINETICS; NITROGEN; STATE;

D O I：

10.3390/molecules29092015

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

The one-pot synthesis of N-doped graphene quantum dots (GQDs), capped with a positively charged polyamine (trien), has been realized through a microwave-assisted pyrolysis on solid L-glutamic acid and trien in equimolar amounts. The resulting positively charged nanoparticles are strongly emissive in aqueous solutions and are stable for months. The interaction with the anionic tetrakis(4-sulphonatophenyl)porphyrin (TPPS4) has been investigated at neutral and mild acidic pH using a combination of UV/vis absorption spectroscopy together with static and time-resolved fluorescence emission. At pH = 7, the experimental evidence points to the formation of a supramolecular adduct mainly stabilized by electrostatic interactions. The fluorescence emission of the porphyrin is substantially quenched while GQDs remain still emissive. On decreasing the pH, protonation of TPPS4 leads to formation of porphyrin J-aggregates through the intermediacy of the charged quantum dots.

引用

页数：17

共 74 条

[1] One-pot direct synthesis of fluorescent polyaniline-porphyrin macrospheres from porphyrin [J].