Tris(n-propyl)phosphine and Tris(isopropyl)phosphine

Single crystals of the low-melting title compound, tris(n-propyl)phosphine, C9H21P, (1), and its isomer, tris(isopropyl)phosphine, (2), were grown in situ in capillaries. The crystal and molecular structures of both compounds were determined at 102 K. Compound (1) has an approximate mirror plane and C—P—C angles between 99.8 (1) and 102.3 (1)°, whereas compound (2) displays no molecular symmetry and C—P—C angles ranging from 102.0 (1) to 104.7 (1)°.