Photophysical properties and energy transfer pathway of Er(III) complexes with Pt-porphyrin and terpyridine ligands

Min Kook Nah; Jae Buem Oh; Hwan Kyu Kim; Kyong Hoon Choi; Yong Rok Kim; Jun Gill Kang

doi:10.1021/jp0688512

Photophysical properties and energy transfer pathway of Er(III) complexes with Pt-porphyrin and terpyridine ligands

Min Kook Nah, Jae Buem Oh, Hwan Kyu Kim, Kyong Hoon Choi, Yong Rok Kim, Jun Gill Kang

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

26 Citations (Scopus)

Abstract

The photophysical properties of Er(III) complexes coordinated with platinum[5,10,15-triphenyl-20-(4-carboxyphenyO-porphyrin] (PtP) and terpyridine (tpy) ligands in organic solution were investigated. The Er-(III) complex emitted sensitized near-IR (NIR) luminescence when the PtP ligands were excited under deoxygenated conditions. The quantum yield (Φ_Ln) of the sensitized luminescence was 0.015%, as evaluated from luminescence lifetime. The photophysical studies and theoretical calculations suggest that the Förster resonance mechanism is very suitable for the energy transfer from PtP to the Er(III) ion and occurred through the first triplet excited state of PtP. The 12.3% energy transfer from the triplet state to the ⁴F _9/2 and ⁴I_9/2 states of Er(III) occurred with a rate distribution of 3.36 × 10⁵ and 6.67 × 10 ⁴ s^-1, respectively. In addition, the observed triplet quantum yield of the PtP ligand in [Ln(PtP)₃(tpy)] proved that the energy transfer from the singlet excited state of the PtP ligand to the Er(III) ion did not take place.

Original language	English
Pages (from-to)	6157-6164
Number of pages	8
Journal	Journal of Physical Chemistry A
Volume	111
Issue number	28
DOIs	https://doi.org/10.1021/jp0688512
Publication status	Published - 2007 Jul 19

All Science Journal Classification (ASJC) codes

Physical and Theoretical Chemistry

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10.1021/jp0688512

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@article{b39e6e9876dc425384f094bfe2f7e3e3,

title = "Photophysical properties and energy transfer pathway of Er(III) complexes with Pt-porphyrin and terpyridine ligands",

abstract = "The photophysical properties of Er(III) complexes coordinated with platinum[5,10,15-triphenyl-20-(4-carboxyphenyO-porphyrin] (PtP) and terpyridine (tpy) ligands in organic solution were investigated. The Er-(III) complex emitted sensitized near-IR (NIR) luminescence when the PtP ligands were excited under deoxygenated conditions. The quantum yield (ΦLn) of the sensitized luminescence was 0.015%, as evaluated from luminescence lifetime. The photophysical studies and theoretical calculations suggest that the F{\"o}rster resonance mechanism is very suitable for the energy transfer from PtP to the Er(III) ion and occurred through the first triplet excited state of PtP. The 12.3% energy transfer from the triplet state to the 4F 9/2 and 4I9/2 states of Er(III) occurred with a rate distribution of 3.36 × 105 and 6.67 × 10 4 s-1, respectively. In addition, the observed triplet quantum yield of the PtP ligand in [Ln(PtP)3(tpy)] proved that the energy transfer from the singlet excited state of the PtP ligand to the Er(III) ion did not take place.",

author = "Nah, {Min Kook} and Oh, {Jae Buem} and Kim, {Hwan Kyu} and Choi, {Kyong Hoon} and Kim, {Yong Rok} and Kang, {Jun Gill}",

year = "2007",

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doi = "10.1021/jp0688512",

language = "English",

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T1 - Photophysical properties and energy transfer pathway of Er(III) complexes with Pt-porphyrin and terpyridine ligands

AU - Nah, Min Kook

AU - Oh, Jae Buem

AU - Kim, Hwan Kyu

AU - Choi, Kyong Hoon

AU - Kim, Yong Rok

AU - Kang, Jun Gill

PY - 2007/7/19

Y1 - 2007/7/19

N2 - The photophysical properties of Er(III) complexes coordinated with platinum[5,10,15-triphenyl-20-(4-carboxyphenyO-porphyrin] (PtP) and terpyridine (tpy) ligands in organic solution were investigated. The Er-(III) complex emitted sensitized near-IR (NIR) luminescence when the PtP ligands were excited under deoxygenated conditions. The quantum yield (ΦLn) of the sensitized luminescence was 0.015%, as evaluated from luminescence lifetime. The photophysical studies and theoretical calculations suggest that the Förster resonance mechanism is very suitable for the energy transfer from PtP to the Er(III) ion and occurred through the first triplet excited state of PtP. The 12.3% energy transfer from the triplet state to the 4F 9/2 and 4I9/2 states of Er(III) occurred with a rate distribution of 3.36 × 105 and 6.67 × 10 4 s-1, respectively. In addition, the observed triplet quantum yield of the PtP ligand in [Ln(PtP)3(tpy)] proved that the energy transfer from the singlet excited state of the PtP ligand to the Er(III) ion did not take place.

AB - The photophysical properties of Er(III) complexes coordinated with platinum[5,10,15-triphenyl-20-(4-carboxyphenyO-porphyrin] (PtP) and terpyridine (tpy) ligands in organic solution were investigated. The Er-(III) complex emitted sensitized near-IR (NIR) luminescence when the PtP ligands were excited under deoxygenated conditions. The quantum yield (ΦLn) of the sensitized luminescence was 0.015%, as evaluated from luminescence lifetime. The photophysical studies and theoretical calculations suggest that the Förster resonance mechanism is very suitable for the energy transfer from PtP to the Er(III) ion and occurred through the first triplet excited state of PtP. The 12.3% energy transfer from the triplet state to the 4F 9/2 and 4I9/2 states of Er(III) occurred with a rate distribution of 3.36 × 105 and 6.67 × 10 4 s-1, respectively. In addition, the observed triplet quantum yield of the PtP ligand in [Ln(PtP)3(tpy)] proved that the energy transfer from the singlet excited state of the PtP ligand to the Er(III) ion did not take place.

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Photophysical properties and energy transfer pathway of Er(III) complexes with Pt-porphyrin and terpyridine ligands

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