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<p class=MsoNormal><b><span style='font-size:14.0pt;font-family:"Times New Roman","serif"'>SEMINARIO
DE QUIMICA ORGANICA 2011<o:p></o:p></span></b></p>
<p class=MsoNormal><b><span style='font-size:16.0pt;font-family:"Times New Roman","serif";
color:#00B050'>Mi¨¦rcoles 27 de abril, 13 hs<o:p></o:p></span></b></p>
<p class=MsoNormal><b><span style='font-family:"Times New Roman","serif"'>Aula
de Seminario, Departamento de Qu¨ªmica Org¨¢nica, FCEyN</span></b><b><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></b></p>
<p class=MsoNormal><b><span style='font-family:"TimesNewRomanPS-BoldMT","serif";
color:black'><o:p> </o:p></span></b></p>
<p class=MsoNormal align=center style='text-align:center;text-autospace:none'><b><span
lang=EN-US style='font-size:15.0pt;font-family:"TimesNewRomanPS-BoldMT","serif";
color:#002060'>Professor Maxwell J. Crossley<o:p></o:p></span></b></p>
<p class=MsoNormal align=center style='text-align:center;text-autospace:none'><b><span
lang=EN-US style='font-family:"TimesNewRomanPS-BoldMT","serif";color:#002060'>School
of Chemistry, The University of Sydney, NSW 2006, Australia</span></b><b><span
lang=EN-US style='font-size:12.0pt;font-family:"TimesNewRomanPS-BoldMT","serif";
color:#002060'><o:p></o:p></span></b></p>
<p class=MsoNormal align=center style='text-align:center;text-autospace:none'><span
lang=EN-US style='font-family:"TimesNewRomanPS-BoldMT","serif";color:#002060'><o:p> </o:p></span></p>
<p class=MsoNormal align=center style='text-align:center'><b><span lang=FR
style='font-size:16.0pt;font-family:"Times New Roman","serif";color:#C10000'>Ring-annulated
Porphyrins for Photochemical Upconversion</span></b><b><span lang=EN-US
style='font-size:16.0pt;font-family:"Times New Roman","serif";color:#C10000'><o:p></o:p></span></b></p>
<p class=MsoNormal align=center style='text-align:center'><span lang=EN-US
style='font-size:12.0pt'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-align:justify;text-indent:36.0pt'><span
lang=EN-US>Ring annulation of the pyrrolic rings of porphyrins leads to very
interesting compounds that behave as </span>¦Ð<span lang=EN-US>-expanded
systems. We previously synthesised tetrakis(quinoxalino)porphyrins, porphyrins
that are expanded in four directions; for example, Pd(II)
tetrakisquinoxalinoporphyrin <b>2</b> from the porphyrin <b>1</b> by three different
routes (Scheme 1).<sup>1 </sup>These syntheses and extrapolation of this
methodology which allows synthesis of tetrakis(diaza-anthraceno)porphyrins and
other </span>¦Ð<span lang=EN-US>-expanded porphyrin systems will be described in
detail.<o:p></o:p></span></p>
<p class=MsoNormal style='text-align:justify;text-indent:36.0pt'><span
lang=EN-US style='font-family:"Times New Roman","serif"'>Upconversion is the
process whereby a stream of light of a given photon energy is converted into
one of a higher energy. Very efficient red to yellow light upconversion is
achieved by triplet-triplet annihilation using the palladium </span><span
style='font-family:"Times New Roman","serif"'>¦Ð</span><span lang=EN-US
style='font-family:"Times New Roman","serif"'>-expanded porphyrins as
sensitizer molecules and rubrene as the emitter molecule We have demonstrated
TTA efficiencies estimated at 60%, far in excess of the statistical 11.1% limit
of singlet formation.<sup>2</sup></span><span lang=EN-US style='font-family:
"Times New Roman","serif"'> </span><span lang=EN-US style='font-family:"Times New Roman","serif"'>I
will also report red to green, red to blue, and green to blue upconversion
using other emitters.<o:p></o:p></span></p>
<p class=MsoNormal style='text-align:justify;text-indent:36.0pt'><span
lang=EN-US style='font-family:"Times New Roman","serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Times New Roman","serif"'>1.
T. Khoury and M.J. Crossley, <i>Chem. Commun</i>., <b>2007</b>, 4851. <b><o:p></o:p></b></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Times New Roman","serif"'>2.
Y.Y. Cheng, B. F¨¹ckel, T. Khoury, R.G.C.R Clady, M.J.Y. Tayebjee, N.J.
Ekins-Daukes, M.J. Crossley, and T.W. Schmidt, </span><i><span lang=FR
style='font-family:"Times New Roman","serif"'>J. Phys. Chem. Lett.</span></i><span
lang=FR style='font-family:"Times New Roman","serif"'>,<b> 2010</b>, <i>1</i>,1795-1799</span><span
style='font-family:"Times New Roman","serif"'>.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
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