ΔHf: -36.8 kcal/mol, REF: "Spectroscopic Properties of Inorganic and Organometallic Compounds", Royal Society of Chemistry, Spottiswoode Ballantyne Ltd., Colchester and London, 1980, Vol. 14. Dipole: 7.2 Debye, REF: NIST Chemistry WebBook, NIST Standard Reference Database, No. 69; W. G. Mallard, P. J. Linstrom, Eds., National Institute of Standards and Technology, Gaithersberg, http://webbook.nist.gov/chemistry. I.P.: 9.4 eV, REF: R. D. Levin, S. G. Lias, "Ionization Potentials and Appearance Potential Measurements," 1971-1981, Natl. Stand. Ref. Data Ser., Natl. Bur. Stand. 71, (1982), Cat. No. C13.48:71.