Instrument Center,Gifu Pharmaceutical University,,Japan This paper reports the IR, UV and NMR spectroscopic study of 1, 4, 7, 10, 13, 16hexaazacyclooctadecane and its Pd²⁺,Cr³⁺ complex compounds. In this study, the IR peaks corresponding to the stretching vibration of Pd-N,Cr-N complex bonds were determined to be at 502 cm-1 and 492 cm-1 respectively; the UV absorption peak at 354 nm(ε=1414) of water solution of the Pd²⁺ complex compound and the UV absorption peaks at 467. 2 nm(ε=220), 366. 2 nm(ε=80) of water solution of the Cr³⁺ complex compound were supposed to have been resulted from the dd energy transition of electron d orbits of Pd²⁺ and Cr³⁺ central ions