Diels-Alder cycloaddition of C60 with 1, 1'-biindene under controlled conditions affords a stable monoadduct C60(C9H7-C9H7) of novel structure, which was confirmed by HPLC, FT-IR, FD-MS, ^1H NMR, ^13C NMR, HMQC and HMBC spectra. Its two bridgehead cage carbons resonate at 70.91. The ^13C NMR spectra show 38 lines consistent with the Cs symmetry associated with [6, 6] addition. In addition, the high solubility of this adduct in polar solvents such as THF, acetone makes it suitable to a good application in the investigation of LB film and optical limiting properties.

Key words: FULLERENES, INDENE P, STRUCTURE CHARACTERISTICS, HIGH SPEED LIQUID CHROMATOGRAPHY, INFRARED SPECTROPHOTOMETRY, MASS SPECTROGRAPHY, PROTON MAGNETIC RESONANCE SPECTROMETRY, L-B MEMBRANE, CHEMICAL SHIFT