Neutral triangular macrocyclic compounds, [PdX2(4,7-phen)](3). (DMF)(3) center dot Et2O (X = CI, Br; 4,7-phen = 4,7-phenanthroline; DMF = N,N'-dimethylformamide; Et2O = diethyl ether), were synthesized, and their molecular structures were characterized. Solution-state 'H NMR results suggested the formation of metal-ligand bonds, and single-crystal X-ray crystallography revealed clear triangular structures. A detailed examination of the structures indicated the formation of two kinds of cavities in the solid state, where a triangular unit works as a halogen-based receptor for polar and apolar solvents through weak hydrogen-bonding and dipole dipole interaction.