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Crystal structure of sodium hexafluorophosphate complexes with dibenzo-18-crown-6 and dibenzo-24-crown-8

Continuing systematic study on the alkali metal complexes with the different dibenzo crown ethers in order to determine the conformation of the ligand ring and also the coordination of the different metal cations, crystal structure of sodium hexafluorophosphate complexes with dibenzo-18-crown-6 (1) and dibenzo-24-crown-8 (2) has been described. Structure of (1) consists of the ion-pair complex with the Na atom coordinated to the six O atoms of the dibenzo-18-crown-6 ring and also to the water molecule in the apical position. The H atoms of the water molecule could not be located accurately but there are short contacts with the O atoms from the second uncomplexed crown molecule which indicate the hydrogen bonding. In (2) the Na ion is completely encapsulated by the crown molecule and coordinated to the eight oxygen atoms forming nesting complex.

crystal structure; crown ether complex; sodium hexafluorophosphate

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