The object of the present invention is to provide an excellent method for storing and transporting hydrogen.

The object can be solved by a structure comprising boron, hydrogen, and oxygen, that has BHB bonds, BH bonds, and BOH bonds, and in the measurement of FT-IR spectra, the following formulas are satisfied: (1) 0.80?a/c?0.96, and (2) 0.95?b/c?1.12, wherein when the baseline is defined as 100%, a is the transmittance at 1400 cm.sup.?1 in the FT-IR spectrum, b is the transmittance at 2500 cm.sup.?1 in the FT-IR spectrum, and c is the transmittance at 3200 cm.sup.?1 in the FT-IR spectrum.