Creation of Metal-to-Ligand Charge Transfer Excited States with Two-Photon Excitation

Felix N. Castellano; Henryk Malak; Ignacy Gryczynski; Joseph R. Lakowicz

doi:10.1021/ic970334y

Creation of Metal-to-Ligand Charge Transfer Excited States with Two-Photon Excitation

Felix N. Castellano, Henryk Malak, Ignacy Gryczynski, Joseph R. Lakowicz

Microbiology, Immunology & Genetics

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Abstract

We examined the steady state and time-resolved emission spectral properties of [Ru(bpy)₃]²⁺ and [Ru(bpy)₂-(dcb)]²⁺, where bpy is 2,2′-bipyridine and deb is 2,2′-bipyridine-4,4′-dicarboxylic acid, in fluid solution when excited with 90 fs pulses from a mode-locked Ti/sapphire laser. Over the wavelength range 820-900 nm, both complexes displayed two-photon excitation as observed by a quadratic dependence of the emission intensity on incident power. Steady state emission and time-resolved frequency-domain intensity decay measurements revealed that two-photon excitation of each complex resulted in the same emission spectra and single-exponential decays as observed for one-photon excitation at a variety of temperatures in different solvents. The two-photon excitation cross section of [Ru(bpy)₃]²⁺ measured at 880 nm was determined to be 4.3 × 10^-50 cm⁴ s/photon. These results clearly show that metal-to-ligand charge transfer (MLCT) excited states can in fact be obtained through multiphoton processes.

Original language	English
Pages (from-to)	5548-5551
Number of pages	4
Journal	Inorganic Chemistry
Volume	36
Issue number	24
DOIs	https://doi.org/10.1021/ic970334y
State	Published - 1997

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@article{e05862e8b986424a85f6a66c2a89c6a3,

title = "Creation of Metal-to-Ligand Charge Transfer Excited States with Two-Photon Excitation",

abstract = "We examined the steady state and time-resolved emission spectral properties of [Ru(bpy)3]2+ and [Ru(bpy)2-(dcb)]2+, where bpy is 2,2′-bipyridine and deb is 2,2′-bipyridine-4,4′-dicarboxylic acid, in fluid solution when excited with 90 fs pulses from a mode-locked Ti/sapphire laser. Over the wavelength range 820-900 nm, both complexes displayed two-photon excitation as observed by a quadratic dependence of the emission intensity on incident power. Steady state emission and time-resolved frequency-domain intensity decay measurements revealed that two-photon excitation of each complex resulted in the same emission spectra and single-exponential decays as observed for one-photon excitation at a variety of temperatures in different solvents. The two-photon excitation cross section of [Ru(bpy)3]2+ measured at 880 nm was determined to be 4.3 × 10-50 cm4 s/photon. These results clearly show that metal-to-ligand charge transfer (MLCT) excited states can in fact be obtained through multiphoton processes.",

author = "Castellano, {Felix N.} and Henryk Malak and Ignacy Gryczynski and Lakowicz, {Joseph R.}",

year = "1997",

doi = "10.1021/ic970334y",

language = "English",

volume = "36",

pages = "5548--5551",

journal = "Inorganic Chemistry",

issn = "0020-1669",

publisher = "American Chemical Society",

number = "24",

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TY - JOUR

T1 - Creation of Metal-to-Ligand Charge Transfer Excited States with Two-Photon Excitation

AU - Castellano, Felix N.

AU - Malak, Henryk

AU - Gryczynski, Ignacy

AU - Lakowicz, Joseph R.

PY - 1997

Y1 - 1997

N2 - We examined the steady state and time-resolved emission spectral properties of [Ru(bpy)3]2+ and [Ru(bpy)2-(dcb)]2+, where bpy is 2,2′-bipyridine and deb is 2,2′-bipyridine-4,4′-dicarboxylic acid, in fluid solution when excited with 90 fs pulses from a mode-locked Ti/sapphire laser. Over the wavelength range 820-900 nm, both complexes displayed two-photon excitation as observed by a quadratic dependence of the emission intensity on incident power. Steady state emission and time-resolved frequency-domain intensity decay measurements revealed that two-photon excitation of each complex resulted in the same emission spectra and single-exponential decays as observed for one-photon excitation at a variety of temperatures in different solvents. The two-photon excitation cross section of [Ru(bpy)3]2+ measured at 880 nm was determined to be 4.3 × 10-50 cm4 s/photon. These results clearly show that metal-to-ligand charge transfer (MLCT) excited states can in fact be obtained through multiphoton processes.

AB - We examined the steady state and time-resolved emission spectral properties of [Ru(bpy)3]2+ and [Ru(bpy)2-(dcb)]2+, where bpy is 2,2′-bipyridine and deb is 2,2′-bipyridine-4,4′-dicarboxylic acid, in fluid solution when excited with 90 fs pulses from a mode-locked Ti/sapphire laser. Over the wavelength range 820-900 nm, both complexes displayed two-photon excitation as observed by a quadratic dependence of the emission intensity on incident power. Steady state emission and time-resolved frequency-domain intensity decay measurements revealed that two-photon excitation of each complex resulted in the same emission spectra and single-exponential decays as observed for one-photon excitation at a variety of temperatures in different solvents. The two-photon excitation cross section of [Ru(bpy)3]2+ measured at 880 nm was determined to be 4.3 × 10-50 cm4 s/photon. These results clearly show that metal-to-ligand charge transfer (MLCT) excited states can in fact be obtained through multiphoton processes.

UR - http://www.scopus.com/inward/record.url?scp=0001280450&partnerID=8YFLogxK

U2 - 10.1021/ic970334y

DO - 10.1021/ic970334y

M3 - Article

AN - SCOPUS:0001280450

SN - 0020-1669

VL - 36

SP - 5548

EP - 5551

JO - Inorganic Chemistry

JF - Inorganic Chemistry

IS - 24

ER -

Creation of Metal-to-Ligand Charge Transfer Excited States with Two-Photon Excitation

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