Orient Show: Orienteering on a micro scale Niamh O’Boyle & Darren Burke May 2009.
Towards Practical Molecular Devices Noel O’Boyle Han Vos Research Group X246.
-
date post
21-Dec-2015 -
Category
Documents
-
view
215 -
download
0
Transcript of Towards Practical Molecular Devices Noel O’Boyle Han Vos Research Group X246.
![Page 1: Towards Practical Molecular Devices Noel O’Boyle Han Vos Research Group X246.](https://reader035.fdocuments.net/reader035/viewer/2022062714/56649d695503460f94a47531/html5/thumbnails/1.jpg)
Towards Practical Molecular Devices
Noel O’BoyleHan Vos Research Group X246
![Page 2: Towards Practical Molecular Devices Noel O’Boyle Han Vos Research Group X246.](https://reader035.fdocuments.net/reader035/viewer/2022062714/56649d695503460f94a47531/html5/thumbnails/2.jpg)
Introduction Molecular device
“capable of performing a useful function at the molecular level”
Supermolecule “has the intrinsic properties of each of its
components” “has properties above and beyond those of
the individual components”
![Page 3: Towards Practical Molecular Devices Noel O’Boyle Han Vos Research Group X246.](https://reader035.fdocuments.net/reader035/viewer/2022062714/56649d695503460f94a47531/html5/thumbnails/3.jpg)
Supramolecular chemistry
Ground state
Excited state
![Page 4: Towards Practical Molecular Devices Noel O’Boyle Han Vos Research Group X246.](https://reader035.fdocuments.net/reader035/viewer/2022062714/56649d695503460f94a47531/html5/thumbnails/4.jpg)
Supramolecular chemistry
Ground state
Excited state
![Page 5: Towards Practical Molecular Devices Noel O’Boyle Han Vos Research Group X246.](https://reader035.fdocuments.net/reader035/viewer/2022062714/56649d695503460f94a47531/html5/thumbnails/5.jpg)
Supramolecular chemistry
Ground state
Excited state (1)
![Page 6: Towards Practical Molecular Devices Noel O’Boyle Han Vos Research Group X246.](https://reader035.fdocuments.net/reader035/viewer/2022062714/56649d695503460f94a47531/html5/thumbnails/6.jpg)
Supramolecular chemistry
Ground state
Excited state (1)
![Page 7: Towards Practical Molecular Devices Noel O’Boyle Han Vos Research Group X246.](https://reader035.fdocuments.net/reader035/viewer/2022062714/56649d695503460f94a47531/html5/thumbnails/7.jpg)
Supramolecular chemistry
Ground state
Excited state (1)
Excited state (2)
![Page 8: Towards Practical Molecular Devices Noel O’Boyle Han Vos Research Group X246.](https://reader035.fdocuments.net/reader035/viewer/2022062714/56649d695503460f94a47531/html5/thumbnails/8.jpg)
Supramolecular chemistry
Ground state
![Page 9: Towards Practical Molecular Devices Noel O’Boyle Han Vos Research Group X246.](https://reader035.fdocuments.net/reader035/viewer/2022062714/56649d695503460f94a47531/html5/thumbnails/9.jpg)
Metal-Metal dyads
RuN
N
NN
OHO
OHO
O
OH
O
OH
N
NN
NN
RuN
N
N N
RuN
N
NN
OHO
OHO
O
OH
O
OH
N
NN
NN
OsN
N
N N
Ru-Ru Ru-Os
3+ 3+
![Page 10: Towards Practical Molecular Devices Noel O’Boyle Han Vos Research Group X246.](https://reader035.fdocuments.net/reader035/viewer/2022062714/56649d695503460f94a47531/html5/thumbnails/10.jpg)
Molecular device
Ru
e-
TiO2- +
![Page 11: Towards Practical Molecular Devices Noel O’Boyle Han Vos Research Group X246.](https://reader035.fdocuments.net/reader035/viewer/2022062714/56649d695503460f94a47531/html5/thumbnails/11.jpg)
Molecular device
e-
e-
-
+
![Page 12: Towards Practical Molecular Devices Noel O’Boyle Han Vos Research Group X246.](https://reader035.fdocuments.net/reader035/viewer/2022062714/56649d695503460f94a47531/html5/thumbnails/12.jpg)
Charge injection
Can be studied using: UV-Vis of ruthenium complex UV-Vis of TiO2
Lifetime of excited state of ruthenium complex
But occurs in <100 fs! (ultrafast)
![Page 13: Towards Practical Molecular Devices Noel O’Boyle Han Vos Research Group X246.](https://reader035.fdocuments.net/reader035/viewer/2022062714/56649d695503460f94a47531/html5/thumbnails/13.jpg)
Outline of future work
Slow down the charge injection
Change surface roughnesses
Use different surfaces
Use different complexes
![Page 14: Towards Practical Molecular Devices Noel O’Boyle Han Vos Research Group X246.](https://reader035.fdocuments.net/reader035/viewer/2022062714/56649d695503460f94a47531/html5/thumbnails/14.jpg)
Semiempirical calculations Using ZINDO (in Hyperchem) to find:
Orbital energies Location of HOMO levels Contribution of ligands and metal
centres to orbitals Assign the peaks in the UV-Vis
spectrum to specific transitions between energy levels
![Page 15: Towards Practical Molecular Devices Noel O’Boyle Han Vos Research Group X246.](https://reader035.fdocuments.net/reader035/viewer/2022062714/56649d695503460f94a47531/html5/thumbnails/15.jpg)
H H-1 H-2
-8.94 eV -9.55 eV -9.64 eV 22% Ru, 74% LL, 3% bpy 38% Ru, 54% LL, 8% bpy 74% Ru, 4% LL, 22% bpy
[Ru(bpy)2(pytrzph(OMe)2)]+
![Page 16: Towards Practical Molecular Devices Noel O’Boyle Han Vos Research Group X246.](https://reader035.fdocuments.net/reader035/viewer/2022062714/56649d695503460f94a47531/html5/thumbnails/16.jpg)
Acknowledgements Prof. Han Vos Han Vos Research Group
Enterprise Ireland
For more information see:http://www.dcu.ie/~chemist/Staffpages/han_vos.htm