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Organometallic Compounds - Volume One The Main Group Elements Part Two Groups IV and V (Paperback, Softcover reprint of the original 1st ed. 1979)
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Organometallic Compounds - Volume One The Main Group Elements Part Two Groups IV and V (Paperback, Softcover reprint of the original 1st ed. 1979)
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A very large number of organo derivatives is formed by the Group IV
ele ments silicon, germanium, tin, and lead. In comparing the
general properties of these elements, Table 1. 1 shows that the
first ionization energies decrease (though not in a regular way)
with increase in size and atomic number, con sistent with the
general increase in metallic character of the elements. Electro
negativity values (which have been the subject of considerable
controversy) show no clear trend. Although purely inorganic
compounds of tin(n) and leaden) are well known, almost all organo
Group IV derivatives show an oxidation state of IV. Bonds to carbon
become weaker on passing from silicon to lead, as do the
element-element bonds themselves. With any particular element M (M
= Si, Ge, Sn, or Pb), there is a small decrease in bond energy in
the order: M-Ph > M - Me > M - Et. Although accurate data for
organo derivatives are lacking, strengths of bonds to other
elements probably decrease in the order: M-F> M-O > M-CI >
M-H ~ M-N ~ M-S ~ M-Br > M-I, while for a particular element X,
the order is: Si-X > Ge-X > Sn-X > Pb-X. It is therefore
understandable that reactions leading to Si-F, Si-O, or Si-CI bonds
are especially favoured in a thermodynamic sense.
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