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The National Centre for Sensor Research The National Centre for Sensor Research Figure 2 Results The emission spectrum and absorption spectra (both steady-state and transient) of [Ru(bpy) 2 (dcb) 2- ] are shown in Figure 3 while the emission lifetimes obtained for the partially deuteriated complexes are shown in the Table A. Deuteriation reduces the rate of non-radiative deactivation of the excited state. This leads to increased emission lifetimes provided the excited state is based on the deuteriated ligand. Figure 3 Excited-state resonance Raman measurements (Figure 4) clearly show that the excited state is localised on the dcb 2- . Resonances due to the dcb 3– • anion radical are observed at 1312 and 1212 cm - 1 . Figure 4 Introduction Ruthenium polypyridyl complexes have been widely used as covalently bound dyes in solar energy devices based on nanocrystalline TiO 2 . In addition it has been shown that nanocrystalline TiO 2 surfaces modified with dinuclear RuOs polypyridyl complexes respond in a uniform manner to irradiation as shown below in Figure 1. Figure 1 In most cases the molecular components have been covalently attached via 4,4’-dicarboxy-2,2’- bipyridine (H 2 dcb) type ligands. It is generally assumed that in these assemblies injection into the TiO 2 surface is enhanced by the fact that the excited state is based on the dcb 2- ligand. This assumption is tested here for the model compound [Ru(bpy) 2 (dcb) 2- ] (see Figure 2) by the use of deuteriation in combination with emission lifetime measurements and resonance Raman spectroscopy. Deuteriation Scheme 1 Table A Towards Practical Molecular Devices: the Incorporation of a Solid Substrate as an Active Component in Molecular Assemblies Noel M. O’Boyle , a Wesley R. Browne, a Steve Welter, b Ron T.F. Jukes, b Luisa De Cola, b Colin G. Coates, c John J. McGarvey, c Johannes G. Vos a a National Centre for Sensor Research, School of Chemical Sciences, Dublin City University, Dublin 9, Ireland b Molecular Photonics Group, IMC, University of Amsterdam, Nieuwe Achtergracht 166, NL-1018 WV Amsterdam, the Netherlands c Queens University Belfast, School of Chemistry, Belfast BT9 5AG, Northern Ireland Conclusions Both the variation in emission lifetime as well as the rR spectra observed confirm that the excited state in bpy/dcb 2- complexes is dcb 2- based. The results clearly indicate that deuteriation is a powerful method for the study of the nature of the excited state in complexes of ruthenium. Acknowledgements This work was supported by Enterprise Ireland and COST D19. Ru N N N N N N COOH HOOC N N N N CD 3 D D D D D D D 3 C D 2 O N N D D D D D D HOOC COOH [O] NaOD (ns) Ru(bpy) 2 (dcb 2- ) 562 Ru(bpy) 2 (d 6 -dcb 2- ) 633 Ru(d 8 -bpy) 2 (dcb 2- ) 573 Ru(d 8 -bpy) 2 (d 6 - dcb 2- ) 679 e - e - e - Ru Os Ru Os 400 500 600 700 800 0.0 0.2 0.4 R u(bpy) 3 2+ R u(bpy) 2 (d cb ) A bsorbance W ave len g th (n m ) 0 20000 40000 60000 80000 100000 120000 140000 160000 180000 C ou n ts pe r se co n d 1600 1500 1400 1300 1200 dcb* 3- dcb* 3- dcb* 3- bpy 1604 cm -1 1450 cm -1 1491 cm -1 1212 cm -1 bpy 1312 cm -1 W avenum b er in cm -1 [R u([H 8 ]-bp y) 2 ([H 6 ]-d cb 2- )] [R u([H 8 ]-bp y) 2 ([D 6 ]-d cb 2- )] [R u([D 8 ]-bp y) 2 ([H 6 ]-d cb 2- )] [R u([D 8 ]-bp y) 2 ([D 6 ]-d cb 2- )] Ru(bpy) 2 (H 2 dcb) d 6 -H 2 dcb

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Towards Practical Molecular Devices: the Incorporation of a Solid Substrate as an Active Component in Molecular Assemblies. Noel M. O’Boyle , a Wesley R. Browne, a Steve Welter, b Ron T.F. Jukes, b Luisa De Cola, b Colin G. Coates, c John J. McGarvey, c Johannes G. Vos a. - PowerPoint PPT Presentation

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Page 1: Figure 2 Results

The National Centre for Sensor ResearchThe National Centre for Sensor Research

Figure 2

ResultsThe emission spectrum and absorption spectra (both steady-state and transient) of [Ru(bpy)2(dcb)2-] are shown in Figure 3 while the emission lifetimes obtained for the partially deuteriated complexes are shown in the Table A. Deuteriation reduces the rate of non-radiative deactivation of the excited state. This leads to increased emission lifetimes provided the excited state is based on the deuteriated ligand.

Figure 3

Excited-state resonance Raman measurements (Figure 4) clearly show that the excited state is localised on the dcb2-. Resonances due to the dcb3–• anion radical are observed at 1312 and 1212 cm -1.

Figure 4

IntroductionRuthenium polypyridyl complexes have been widely used as covalently bound dyes in solar energy devices based on nanocrystalline TiO2. In addition it has been shown that nanocrystalline TiO2 surfaces modified with dinuclear RuOs polypyridyl complexes respond in a uniform manner to irradiation as shown below in Figure 1.

Figure 1

In most cases the molecular components have been covalently attached via 4,4’-dicarboxy-2,2’-bipyridine (H2dcb) type ligands. It is generally assumed that in these assemblies injection into the TiO2 surface is enhanced by the fact that the excited state is based on the dcb2- ligand. This assumption is tested here for the model compound [Ru(bpy)2(dcb)2-] (see Figure 2) by the use of deuteriation in combination with emission lifetime measurements and resonance Raman spectroscopy.

Deuteriation

Scheme 1

Table A

Towards Practical Molecular Devices:the Incorporation of a Solid Substrate as anActive Component in Molecular Assemblies

Noel M. O’Boyle,a Wesley R. Browne,a Steve Welter,b Ron T.F. Jukes,b Luisa De Cola,b Colin G. Coates,c

John J. McGarvey,c Johannes G. Vosa

a National Centre for Sensor Research, School of Chemical Sciences, Dublin City University, Dublin 9, Irelandb Molecular Photonics Group, IMC, University of Amsterdam, Nieuwe Achtergracht 166, NL-1018 WV Amsterdam, the Netherlands

c Queens University Belfast, School of Chemistry, Belfast BT9 5AG, Northern Ireland

ConclusionsBoth the variation in emission lifetime as well as the rR spectra observed confirm that the excited state in bpy/dcb2- complexes is dcb2- based. The

results clearly indicate that deuteriation is a powerful method for the study of the nature of the excited state in complexes of ruthenium.

AcknowledgementsThis work was supported by Enterprise Ireland and COST D19.

Ru

NNN

N

N N

COOHHOOC

N N N N

CD3

D

D

D D

D

D

D3C

D2O

N N

D

D

D D

D

D

HOOC COOH[O]

NaOD

(ns)

Ru(bpy)2(dcb2-) 562

Ru(bpy)2(d6-dcb2-) 633

Ru(d8-bpy)2(dcb2-) 573

Ru(d8-bpy)2(d6-dcb2-) 679

e-

e-

e-

Ru Os Ru Os

400 500 600 700 8000.0

0.2

0.4

Ru(bpy)3

2+

Ru(bpy)2(dcb)

Ab

sorb

an

ce

Wavelength (nm)

0

20000

40000

60000

80000

100000

120000

140000

160000

180000

Counts per second

1600 1500 1400 1300 1200

dcb*3-dcb*3-

dcb*3-bpy

1604 cm-1

1450 cm-1

1491 cm-1

1212 cm-1

bpy

1312 cm-1

Wavenumber in cm-1

[Ru([H8]-bpy)

2([H

6]-dcb2-)]

[Ru([H8]-bpy)

2([D

6]-dcb2-)]

[Ru([D8]-bpy)

2([H

6]-dcb2-)]

[Ru([D8]-bpy)

2([D

6]-dcb2-)]

Ru(bpy)2(H2dcb)

d6-H2dcb

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