In the 1970s, when something like chemical graph theory and
molecular topology arose, the quantum chemical community began to
criticise it, mainly with the argument that it reduced chemistry to
mathematics, to empty meaningless numbers, to non-physical
interpretable indices, to a combinatory without synthesis
counterpart, to an algebra (matrices and polynomials) exercise;
moreover, since the kenographs were mainly the objects of the
chemical graph theory study, ie: the chemical structures' skeleton
(mostly of carbon-based contents) excluded the hydrogen structural
influence (the most abundant element of universe) and even the
hetero-atom combination, ie: the essence of chemistry combinations.
Therefore, so what for a whole theory of chemistry just for the
carbon skeleton-based compounds? Years passed and the tension
between the chemical graph theory/topology indices and the
consecrated quantum chemistry/chemical reactivity indices
continued, with fruitful results on both sides. It was not until
the 21st century that arose the so-called nanoscience tendency to
unify all natural sciences that work using models of causes at the
nano-level of matter to describe and predict meso- to micro-/macro-
chemistry (ie: the chemistry of materials nowadays) with certain
influences in bio-/eco-/pharmaco- toxicology and environment, so in
everyday life and a sustainable (or not) future on planet Earth
(double "aa" is for emergency)! The dawn of the XXI century brings
the fertile idea that nanosystems are benchmarks of extended carbon
systems, whose nano-precursors are benzenoids' condensations, so
reviving in a surprising manner the interest of chemical graph
theory first and then on its quantitative output through
topological indices; yet, nowadays the challenge is double:
nanochemistry should "colour" the topology with quantum information
and be applied to medium-to larger systems. The kenographs are no
longer a problem as far-extended saturated systems are under focus;
moreover, what is abstracted for graphs and nano-skeletons may work
for Carbon as well as for Silicium, so opening/preparing the next
stage in nanochemistry -- the chemistry of Silicium, with so much
promise to connect with long-expected first nano-tronic devices on
a main stream level with harvesting, ecology, and sustainability
effects in economy and social life! Aiming to document this
undeniable nano-chemistry future, the present volume, while
continuing the series, contains world-class research.
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