Complexes of 1,8-bis(dimethylamino)naphthalene, known also as DMAN, with phthalic acid, terephthalic acid, and 5-aminoisophthalic acid were synthesized and investigated by means of powder diffraction methods. DMAN and phthalic acid complexes crystallize in the orthorhombic system, space group Pnmm (59) with the lattice parameters a=1.17423(3) nm, b=1.7124(4) nm, c=0.9933(4) nm, V=1.997 24 nm3, whereas DMAN complexes with terephthalic acid or 5-aminoisophthalic acid crystallize in the monoclinic system in the space group P2 or P2∕m with the lattice parameters a=2.4337(5) nm, b=0.9665(2) nm, c=1.1800(3) nm, β=91.53(2)°, V=2.774 51 nm3 and a=2.1609(7) nm, b=1.1017(6) nm, c=1.8921(7) nm, β=112.095(34)°, V=4.173 46 nm3, respectively.
