We report a magnetic investigation of the endohedral metallofullerene La@C-82.(CS2)1.5 Firstly, pure La@C-82 was prepared and isolated, then single crystals were grown by a slow evaporation method. The crystals were screened by x-ray diffraction measurements and the structure was confirmed to be a body centered cubic lattice a=25.62(Angstrom) with space group I-43d. Optical absorption measurement revealed the compound to be a localised insulating or semi-conducting with a band gap around 2500cm(-1) Temperature dependent EPR and SQUID measurements indicate that the high temperature magnetic behavior is that of a Curie-Weiss paramagnet, C=0.4(+/-0.1)cm(3)mol(-1) K, which corresponds to a single spin localised on the Cg? cage, Furthermore, a large negative Weiss constant, theta = -150(+/-20)K, indicates the presence of strong antiferromagnetic interactions. EPR measurements show a sharp decrease in the line width occuring below around 160K, indicating a phase transition. The Curie moment appears to be lost at temperatures below 80K.