Prepd by fluorination of manganese iodide according to the equation 2MnI2 + 13F2 → 2MnF3 + 4IF5: Moissan, Compt. Rend. 130, 622 (1900); v. Wartenberg, Z. Anorg. Allg. Chem. 244, 346 (1940); Kwasnik in Handbook of Preparative Inorganic Chemistry vol. 1, G. Brauer, Ed. (Academic Press, New York, 2nd ed., 1963) pp 263-264.