| সংক্ষিপ্ত: | <p>This thesis describes the synthesis, characterisation and reactivity studies of NHC-amido and
phosphine-amido stabilised low valent heavier group 14 compounds.</p>
<p>In Chapter 1, a general introduction of the development of interesting main group compounds
in the recent decades is provided. The classes of compound include carbenes, metallylenes,
low valent germanium cations and the heavier group 14 alkyne analogues. The reactivity
patterns of these types of compound are also discussed. The aims of this DPhil project are
described.</p>
<p>In Chapter 2, the experimental techniques and analytical methods employed in this project are
summarised. Details of starting materials syntheses following modified literature procedures
are also given.</p>
<p>In Chapter 3, the synthesis and structural properties of a series of low valent monohalo
germanium, tin and lead compounds stabilised by a chelating N<sub>amido</sub>^C<sub>NHC</sub> ligand system are
described and compared. These compounds serve as precursors towards more reactive
derivatives in the following chapters. The synthesis of a Ge(I) dimer upon reduction and its
preliminary reactivity towards dihydrogen are also explored.</p>
<p>In Chapter 4, the synthesis of two novel germyliumylidene cations featuring a N<sub>amido</sub>^C<sub>NHC</sub>
ligand system and their activation of O-H and N-H bonds via metal ligand cooperation, as well
as the oxidative addition of C-Cl bond in dichloromethane, are detailed.</p>
<p>In Chapter 5, the synthesis of low valent germanium(II) compounds stabilised by a
N<sub>amido</sub^P<sub>phosphino</sub> ligand is investigated. From a common chlorogermylene precursor, a novel
germyliumylidene and other Cl-substituted Ge(II) derivatives can be achieved. Attempts to
synthesise a Ge(II) hydride in situ are described and the isolated Ge(II) naphthoxide is shown
to act as an effective pre-catalyst in hydroboration reactions. </p>
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