Abstract
5-Chlorosalicylaldehyde [monoclinic, a = 3.800(2), b = 5.595(4), c = 15.174(11) A, β = 93.221(17)°, space group P21] exhibits an unusual crystal structure with both intramolecular and intermolecular OH to CH=O hydrogen bonding, the latter leading to chains of molecules aligned along the b axis. A survey of previous substituted salicylaldehyde structures shows three main hydrogen bonding patterns: intramolecular only (14), intramolecular and intermolecular dimeric (5), and intramolecular and intermolecular polymeric (3). 5-Chlorosalicylaldehyde adopts the rather uncommon polymeric chain structure with both intra- and intermolecular hydrogen bonding.
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