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1. INTRODUCTION 1.1. Background
Schlenk was the first to use the term inclusion compound (IC) to describe the crystalline adducts in which one component (host molecule) crystallizes into a matrix, isolating the second component (guest molecule) into cavities of well-defined geometry [1]. Most of the ICs reported have been described as inclusion compounds or clathrates in the literature. In addition, there are many more compounds that are described as solvates, and many of these must surely be ICs [2].
