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A new Na/Mg inverse crown ether

Kennedy, A.R. and MacLellan, J.G. and Mulvey, R.E. (2003) A new Na/Mg inverse crown ether. Acta Crystallographica Section C: Crystal Structure Communications, 59 (8). M302-M303. ISSN 0108-2701

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Abstract

A 'missing' member of the inverse crown ether family, namely mu(4)-oxo-tetrakis(mu-2,2,6,6-tetramethylpiperidinido)dimagnesium(II)disodium(I), [Na2Mg2O(C9H18N)(4)], has been synthesized by blocking the alternative aromatic metallation route via the use of sterically hindered 1,3,5-mesitylene as a solvent. [Na2Mg2O(NR2)(4)] (NR2 is 2,2,6,6-tetramethylpiperidinide) is shown to form a cationic planar eight-membered ring with alternating metal and N atoms, which captures at its core an oxide guest that lies on an inversion centre [principal dimensions: Na - O = 2.2405 (11) Angstrom, Na - N = 2.445 (3) and 2.572 (3) Angstrom, Mg - O = 1.8673 (9) Angstrom, and Mg - N = 2.032 (2) and 2.063 (2) Angstrom].