Visualization of nonemissive triplet species of Zn(II) porphyrins through Cu(II) porphyrin emission via the reservoir mechanism in a porphyrin macroring

被引：7

作者：

Kuramochi, Yusuke ^{[1
]}

Hashimoto, Sho ^{[2
]}

Kawakami, Yuki ^{[1
]}

Asano, Motoko S. ^{[2
]}

Satake, Akiharu ^{[1
]}

机构：

[1] Tokyo Univ Sci, Grad Sch Chem Sci & Technol, Shinjuku Ku, 1-3 Kagurazaka, Tokyo 1628601, Japan

[2] Gunma Univ, Sch Sci & Technol, Div Mol Sci, 1-5-1 Tenjin Cho, Kiryu, Gunma 3768515, Japan

来源：

PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES | 2018年 / 17卷 / 07期

关键词：

ENERGY-TRANSFER; COPPER-COMPLEXES; EXCITED-STATES; LIGAND; LUMINESCENCE; MACROCYCLE; ARRAYS;

D O I：

10.1039/c8pp00210j

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：

A macroring composed of three Cu(II) porphyrins (CuP) and three slipped-cofacial Zn(II) porphyrin (ZnP2) dimers exhibited near-IR emission from the CuP part. The emission lifetime of the macroring (15 mu s) was 500 times longer compared to that of a Cu porphyrin monomer (e.g., Cu(II) TPP; TPP = meso-tetraphenylporphyrin). The observed emission is ascribed to emission via the reservoir mechanism from the trip-doublet (T-2(1)) state in CuP thermally activated from the T-1 state of ZnP2, which is located ca. 1030 cm(-1) below the T-2(1) state of CuP. The near-IR emission of the macroring was significantly quenched by O-2, whereas that of the Cu porphyrin monomer was hardly quenched, indicating that the quenching event mainly occurred on the T-1 state of the ZnP2 parts. The nonemissive triplet state of a Zn porphyrin at room temperature was visualized through emission from a neighboring Cu porphyrin.

引用

页码：883 / 888

页数：6

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