Bond, dative halogen compounds

Organoaluminum compounds are sufficiently Lewis acidic to interact with weak Lewis bases such as alkyl halides, although stable and thoroughly characterized examples are few. Instead, many trialkylaluminum compounds react violently with halogenated solvents. The adduct MeaSiF-AlEta, with weak F- -Al donation, has been characterized by NMR spectroscopy and this adduct is thermally stable to 30 °C. Structurally characterized examples of aryl halides forming dative bonds to aluminum have been reported for cationic organoaluminum complexes as will be discussed later. 

The stepwise hydrolysis of monoorganotin trihalides can lead to a great variety of compounds. The dative bond hydrated dimers [RSn(0H)X2-H20]2, 20, formed in the first step, containing six-coordinate tin, are associated via intermolecular hydrogen-bonds established between the OH bridges and the halogen atoms. 

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