Download The Nobel Prize in Chemistry for 2000

The Nobel Prize in Chemistry for
2000
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http://www.nobel.se/chemistry/laureates/20
00/illpres/
Question
• Draw the structure of acetylene (Given molecular
formula: C2H2)
• Give the equation for the polymerization reaction
of acetylene, and draw the structure of two
repeating units for the polymer.
• Explain the terms ‘conjugated polymer’.
• Give two reasons that scientists suspect
polyacetylene would conduct electricity.
• Give two reasons that ‘conjugated polymer’ can be
used in TV screens.
• State the potential use of ‘conjugated polymer’
towards energy crisis.
Draw the structure of acetylene
(Given molecular formula: C2H2)
H
C C
H
Give the equation for the polymerization reaction
of acetylene, and draw the structure of two
repeating units for the polymer.
…-(-C=C )n
n H-C=C-H
H H
H
H
C=C
C=C
H
H
Explain the terms ‘conjugated polymer’.
Conjugated polymer means the
polymer consists carbon chain
with C=C double bond and
C-C single bond in alternate
sequence.
Give two reasons that scientists suspect
polyacetylene would conduct electricity.
(1) Polyacetylene so formed is a silvery
film and shines like a metal.
(2) The pi-electrons of C=C double bonds
would delocalize into the C-C single bonds
and hence could move freely through the
whole carbon chain.
Give two reasons that ‘conjugated
polymer’ can be used in TV screens.
• ‘Conjugated polymer’ can be made as a
semiconductor and
• ‘Conjugated polymer’ exhibits electroluminescence, it glows when a voltage passes
through.
• N.B. ‘Conjugated polymers’ are the material that
coated on the TV screen, no Cathode ray tube is
necessary in this kind of TV.
State the potential use of ‘conjugated polymer’
towards energy crisis.
‘Conjugated polymer’ can be
used to make solar cells. Such
devices are potentially useful to
convert solar enery into electrical
energy.
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