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This article reports [1, 2, 4, 5-tetra(4'-carboxyphenyl)-benzene]  (1 ) and its tetraethyl ammonium and tetrabutylammonium inclusion compounds (C 34 H 21 O 8− ·N + (C 2 H 5 ) 4 ·H 2 O ( 2 ) C 34 H 21 O 8− ·N + ( n -C 3 H 7 ) 4 ·H 2 O ( 3 ). Compound  one  eventually forms a "molecular column" along the direction of [110], and the solvent molecules are filled by two adjacent columns to form a stable crystal structure. In compound  2 , the tetravalent host anion forms rectangular three-dimensional pores with water molecules by O-H… O hydrogen bonds, two tetraethyl ammonium ions are neatly arranged in the pores to form a tighter structure, In structure  3 , the formation of the main skeleton mainly relies on O…H…O hydrogen bond formed by the contact between the proton H shared between the two host anions and the O-H…O generated by the water molecule and one of the two anions. In the three crystal structures, [1, 2, 4, 5-tetra(4'-carboxyphenyl)-benzene], as an “X” polycyclic polycarboxylate aromatic molecule, constructs a large 3 D hole by using its configuration feature. Corresponding solvent molecules and different guest molecules are contained in the 3 D pores, forming various stable crystal structures.

Crystal structures of the solvate and two tetralkylammonium inclusion compounds of [1, 2, 4, 5-tetra(4'-carboxyphenyl) - benzene]