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Crystal and molecular structures of 2 : 1 co-crystals formed between  p -nitrophenylacetic acid and three isomeric  n -pyridinealdazines,  n  = 2( 1 ), 3( 2 ) and 4( 3 ), are described in which the carboxylic acid is always in a general position and the respective  n -pyridinealdazine is located about a centre of inversion. A common feature of the supramolecular aggregation is the formation of three-molecule aggregates sustained by the {… HOCO … N(py)} heterosynthon, further vindicating this as a most reliable synthon for co-crystal design. Molecules are assembled into three-dimensional architectures by C–H … O interactions coupled with C–H … π ( 1 ) or π … π ( 2  and  3 ) contacts.

zeitschrift für kristallographie - crystalline materials 

2 : 1 Co-crystals of  p -nitrophenylacetic acid with three isomeric  n -pyridinealdazines,  n  = 2, 3 and 4, featuring the {… HOCO … N(py)} heterosynthon