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style=3D'font-size:9.0pt;mso-bidi-font-size:10.0pt'> <=
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CHEMISTRY 5404
Advanced Inorganic Che=
mistry
&=
nbsp;
Homework Set 6 &=
nbsp; &nbs=
p; Due Wednesday, 8 December 2004, 10:30 AM
No
late homework accepted. Inclu=
de your
name and student number on your homework.
Group discussions of homework problems are permi=
tted
but answers must be your own individual response and composition. All homework must be signed and
pledged. Include a list of
references with your homework citing all written material, including web si=
tes,
and oral discussions used in the preparation of your homework assignment.
1) Find a paper in the current (2002-=
2004)
Inorganic Chemistry literature that includes an X-ray crystallographic
analysis. Include the citatio=
n for
your paper (with the manuscript title etc.). Your paper can not be one we discu=
ssed
in class. Answer the following
questions concerning the X-ray crystallography in your manuscript. (40 points)
A)
What is the crystal system of the crystal analyzed (i.e. triclinic,
monoclinic, etc.) and what is the space group (i.e. P21/c, P1,
etc.)?
B)
What type of information is provided by the assignment of a crystal
system and how does that vary from the information conveyed by the assignme=
nt
of a space group?
C)
Describe what is meant by the term unit cell and describe how it rel=
ates
to the bulk structure of the solid analyzed.
D)
Often x-ray crystallographic analyses are done at low temperature. What advantages are provided by us=
ing
low temperatures
to perform an x-ray crystallographic analysis?
2) Organom=
etallic
complexes are often said to adhere to the 18 electron rule. What is the 18 electron rule and w=
hy is
18 a desirable number of valence electrons? (10 points)
3) Give the valence electron count fo=
r the
following species. Show your
work. (20 points)<=
/span>
&=
nbsp; A) Ferrocene
&=
nbsp; B) CpMo(CO)3(h1-C3H5)
&=
nbsp; C) [Ir(PPh3)2COCl(2,2’-bipyridin=
e)]2+
&=
nbsp; D) Rh(PEt<=
sub>2Ph)2COCl
4) The reaction of cis-[Pd(PPh3)2=
(CH3)2]
with CH3I affords C2H6 and trans-[Pd(PPh3)2=
sub>(CH3)I]. Provide a step by step mechanism t=
hat is
consistent with this reaction. For
each step describe the nature of the reaction. For each metal complex provide the
coordination number, oxidation number and electron count to illustrate how
these properties change over the course of your reaction scheme. (30 points)
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