The Crystal and Molecular Structures of Two 1:2 Complexes of 1,4-Diazabicyclo[2.2.2]octane (DABCO) with 1-(o-Chlorophenyl)1-phenyl-2-propyn-1-ol (CPPOH), and Those of Two 1:2 Complexes of N,N′-Dimethylpiperazine (DMP) with CPPOH

X-Ray crystal structure analysis of the title four complexes showed that crystals consist of CPPOH···achiral diamine···CPPOH units. In the first two crystals a DABCO molecule is bound by two (−)-CPPOH molecules (1) or by (+)- and (−)-CPPOH (2) to form 1:2 complex by strong intermolecular O–H···N hydrogen bonds [O–H···N=2.707(3) and 2.755(3) (1) and 2.704(4) and 2.747(4) Å (2)]. The latter two crystals are respectively formed by (+)-CPPOH···DMP···(−)-CPPOH complex (3) [O–H···N=2.771(3) Å] and (−)-CPPOH···DMP···(−)-CPPOH complex (4) [O–H···N=2.768(5) and 2.730(6) Å]