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exist in the asymmetric unit and are connected alternately to be
packed in a left-handed helically ordered arrangement with one
turn of 19.44 Å pitch height through a network of intermolecular
hydrogen bonds, within which the distance between the closest
ferrocene units is 6.95 Å (Fe-Fe) (Fig. 3.9a) [10]. Noteworthy is that
an opposite helically ordered molecular assembly, a right-handed
helically ordered arrangement, is formed in the crystal packing of the
ferrocene-peptide bioconjugate
bearing the one dipeptide chain of
the heterochiral sequence (-D-Ala-L-Pro-NH-2-Py) (Fig. 3.9b) [10].
7
(a)
(b)
Figure 3.9
A portion of a layer containing the helical assembly of crystal
packing of (a)
6
and (b)
7
.
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