Tobin Marks and Mark Ratner Northwestern University DMR-0353831 wisted π-Electron “Super Chromophores” for Electro-Optics Worldwide progress in the development of chromophores having exceptionally large molecular hyperpolarizabilities. Electro-optic materials based on molecular π-electron chromophores offer the exciting promise of enabling ultra-high speed optical data transmission and processing. A joint theoretical + synthetic effort by Mark Ratner and Tobin Marks at Northwestern University, in collaboration with researchers at the University of Milano and the University of Perugia in Italy, and the University of Leuven in Belgium, has demonstrated a new concept for chromophore design in which the key materials parameter, , the molecular hyperpolarizability, is maximized by twisting from planarity a π-electron system connecting donor and acceptor 1985 1990 1995 2000 2005 0 200 400 600 800 1000 N N Me 2 N NO 2
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Tobin Marks and Mark Ratner Northwestern University DMR-0353831
Tobin Marks and Mark Ratner Northwestern University DMR-0353831. Twisted π -Electron “Super Chromophores” for Electro-Optics. Electro-optic materials based on molecular π -electron chromophores offer the exciting promise of enabling ultra-high - PowerPoint PPT Presentation
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Tobin Marks and Mark RatnerNorthwestern University
DMR-0353831Twisted π-Electron “Super Chromophores” for Electro-Optics
Worldwide progress in the development ofchromophores having exceptionally large molecular hyperpolarizabilities.
Electro-optic materials based on molecular π-electron chromophores offer the exciting promise of enabling ultra-highspeed optical data transmission and processing.A joint theoretical + synthetic effort by Mark Ratner and Tobin Marks at Northwestern University, in collaboration with researchers at the University of Milano and the University of Perugia in Italy, and the University of Leuven in Belgium, has demonstrated a new concept for chromophore design in which the key materials parameter, , the molecular hyperpolarizability, is maximized by twisting from planarity a π-electron system connecting donor and acceptor substituents. In the accompanying figure, the hyperpolarizability multiplied by the dipole moment () is the quantity measured and is normalized for the molecular weight of the chromophore, Mw. The largest response measured for a twisted chromophore ( = -488,000 x 10-48 esu) is ca. 20x grater than that of any previously reported molecular chromophore.
1985 1990 1995 2000 2005
0
200
400
600
800
1000
NO
t-Bu
t-Bu
N CN
CN
N
t-BuMe2SiO
t-BuMe2SiOO
CN CN
CN
NBu
Bu S
NCCN
CN
NN
Me2NNO2
Tobin Marks and Mark RatnerNorthwestern University
DMR-0353831 Twisted π-Electron “Super Chromophores” for Electro-Optics
Worldwide progress in the development ofchromophores having exceptionally large Molecular hyperpolarizabilities.
1985 1990 1995 2000 2005
0
200
400
600
800
1000
NO
t-Bu
t-Bu
Northwestern5702005
Northwestern943.32005
Northwestern57.82005
NCN
CN
N CN
CN
45.72000
N
t-BuMe2SiO
t-BuMe2SiOO
CN CN
CN
27.11996
NBu
Bu
SO
O
NC
CN
25.51993 2.1
1987
NBu
Bu S
NCCN
CN
NN
Me2NNO2
/M
w a
t 19
07 n
m (
10-4
8es
u)
Year
Broader Impact of this ResearchDMR-0353831
Technological and Commercial Applications
contacts underway with four major corporations interested in high-speed communications hardware
International Collaborations
This is joint work with Leuven (Belgium), Milano ( Italy), and Perugia (Italy).
In a joint project with Cork (Ireland), we are investigation the generality of this twist-controlled hyperpolarizability enhancement