Boswell

Danny L. Maples

Dong

Hubin

Jon D. Silversides

Maples

McClain II

Orpen

Randall D. Maples

Sheldrick

Silversides

Smith

Sprague

Stephen J. Archibald

Timothy J. Hubin

Timothy J. Prior

Trenton H. Parsell

Valks

Weisman

Wesley A. Hoffert

Wong

Acta Crystallographica Section E

The crystal structure of dichlorido(4,10-dimethyl-1,4,7,10-tetraazabicyclo[5.5.2]tetradecane)chromium(III) hexafluoridophosphate, [CrCl2(C12H26N4)]PF6, (I), has monoclinic symmetry (space groupP21/n) at 150 K. The structure of the related dichlorido(4,11-dimethyl-1,4,8,11-tetraazabicyclo[6.6.2]hexadecane)chromium(III) hexafluoridophosphate, [CrCl2(C14H30N4)]PF6, (II), also displays monoclinic symmetry (space groupP21/c) at 150 K. In each case, the CrIIIion is hexacoordinate with twocischloride ions and two non-adjacent N atoms boundcisequatorially and the other two non-adjacent N atoms boundtransaxially in acis-V conformation of the macrocycle. The extent of the distortion from the preferred octahedral coordination geometry of the CrIIIion is determined by the parent macrocycle ring size, with the larger cross-bridged cyclam ring in (II) better able to accommodate this preference and the smaller cross-bridged cyclen ring in (I) requiring more distortion away from octahedral geometry.</jats:p

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Acta Crystallographica Section E Structure Reports Online

Crystal structures of two cross-bridged chromium(III) tetraazamacrocycles

http://journals.iucr.org/e/issues/2014/09/00/wm5051/wm5051.pdf

Crystal structures of two cross-bridged chromium(III) tetraazamacrocycles

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