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Figure 4
Three turns of an extended hydrogen-bonded helix motif in (IIa)[link], viewed perpendicular to the c axis. This helix propagates along the 41 screw axis, parallel to the crystallographic c axis, and includes only mol­ecules of type A (Fig. 3[link]). The CCl4, CH2ClCH2Cl and CHCl2CHCl2 solvates, viz. (IIb)[link], (IIc) and (IId), respectively, all have essentially the same structural feature. Bonds and atoms involved in the helix are drawn with solid colours. Dashed lines indicate continuation of the helix.

Journal logoSTRUCTURAL
CHEMISTRY
ISSN: 2053-2296
Volume 65| Part 10| September 2009| Pages o529-o533
doi:10.1107/S0108270109036476
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