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Isolation and Structural Characterization of Di- and Tetra-protonated Forms of the Macrocyclic Hexaamine trans-6,13-Dimethyl-1,4,8-11-tetraazacyclodecane-6,13-diamine by Paul V. Bernhardt; Geoffrey A. Lawrance; Brian W. Skelton; Allan H. White is a Chemistry article available to read on EtoBox.

What is Isolation and Structural Characterization of Di- and Tetra-protonated Forms of the Macrocyclic Hexaamine trans-6,13-Dimethyl-1,4,8-11-tetraazacyclodecane-6,13-diamine about?

## Abstract Cations derived by protonation of the ligand title compound (L^1^) have been structurally characterized in their di‐ and tetra‐ protonated forms in the salts [H~2~L^1^][ClO~4~]~2~·2H~2~O and [H~4~L^1^][ZnCl~4~]~2~·4H~2~O. In both structures, one half of the formula unit comprises the asymmetric unit of the structure, the macrocycle being centrosymmetric, with the two macrocycles adopting similar conformations. In both salts, a pair of diagonally opposed macrocyclic secondary amine groups are protonated; in the [H~4~L^1^]^4+^ salt, the additional pair of protons are accommodated on the exocyclic pendant amine groups. The dispositions of the pendent amines differ between the two structures, being ‘equatorial’ with respect to the macrocyclic ring in the [H~2~L^1^]^2+^ salt, and ‘axial’ in the [H~4~L^1^]^4+^ salt. In other structurally characterized compounds containing [H~4~L^1^]^4+^ the equatorial disposition was found in the ferricyanide adduct, while in the tetraperchlorate salt the axial disposition was identified. The differences in disposition of the exocyclic groups are ascribed to the extensive H‐bonding in the lattices.

Who reads Isolation and Structural Characterization of Di- and Tetra-protonated Forms of the Macrocyclic Hexaamine trans-6,13-Dimethyl-1,4,8-11-tetraazacyclodecane-6,13-diamine?

Author

Paul V. Bernhardt; Geoffrey A. Lawrance; Brian W. Skelton; Allan H. White

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); Wiley - V C H Verlag GmbbH & Co.; Wiley (ISSN 0372-7874)

Published

2007

Language

EN

Field

Chemistry (Physical Sciences)