Two polymorphic modifications of 1-(N-morpholiniomethyl)spirobi- (3-oxo-2,5-dioxa-1-silacyclopentan)- ate hydrate |
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| Authors: | N Erchak S Belyakov I Kalvinsh K Pypowski E Valbahs E Lukevics |
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| Institution: | (1) Laboratory of X-ray Crystallography, Indian Institute of Chemical Technology (IICT), Room No. 150, Hyderabad , 500 007, India;(2) Organic Chemical Division-II, Indian Institute of Chemical Technology, Hyderabad , 500 007, India |
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| Abstract: | The compound 1-(N-morpholiniomethyl)spirobi(3-oxo-2,5-dioxa-1-silacyclopentan)ate crystallizes from aqueous solution of γ-butyrolactone
in the form of two crystal hydrate modifications: monoclinic (with D = 1.53 g/cm3, space group P 21/n) and triclinic (D = 1.45 g/cm3, space group P1-). For the monoclinic form, an X-ray structural study at -100°C has been performed. For both structures the coordination polyhedron
of the silicon atom is a trigonal bipyramid. In the crystal structures there are strong intermolecular hydrogen bonds of NH···O
and OH···O types. |
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