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Title: Differing modes of crown binding to potassium: K, 18-crown-6 salt of the cyclic phosphate (OCH2CMe2CH2O)P(O)(OH) as a hydrate
Authors: Kommana, Praveen
Swamy, K C Kumara
Issue Date: May-2003
Publisher: NISCAIR-CSIR, India
Abstract: The molecular structure of [K,18-crown-6]+[(OCH2CMe2CH2O)P(O2)]-.H2O (3) has been determined. Potassium is eight coordinate and is connected to an oxygen of the phosphate (that is not part of the six-membered ring), the water oxygen and six oxygen atoms of the crown. The two non-crown oxygens coordinated to potassium are on the same side with respect to the mean plane of the crown oxygen atoms; this mode of coordination is different from that observed in [K,18-crown-6]+[myo-C6H6-2-{OC(O)Ph}-1,3,5-(O3CH)-{4,6-O2P(O)O}]-.3H2O (2) in which the coordination of the non-crown oxygens (an oxygen from the inositol residue and an oxygen from the phosphate) occurs from the opposite sides of the mean plane of the crown oxygen atoms. The water oxygen is hydrogen bonded to two oxygen atoms (that are not part of the six-membered ring) of the phosphate leading to a chain. The six-membered phosphorinane ring has a chair conformation.
Page(s): 1061-1063
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.42A(05) [May 2003]

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