Low-Frequency Fundamentals of Some Metal Carbonyls

Abstract

The carbon‐metal‐carbon bending fundamentals of several metal carbonyls have been determined by the analysis of their combinations with the carbonyl stretching frequencies near 5 μ and by direct observation in the far infrared (60–120 cm^—1). The following vapor‐phase frequencies were obtained (in cm^—1): Fe(CO)₅: 104 (A₂″), 114 and ∼68 (E′), 95 (E″); Ni(CO)₄: 74 (F₂), 68 (E); Cr(CO)₆: 98 (F_1u), 90 (F_2g); Mo(CO)₆: 81 (F_1u), 81 (F_2g); W(CO)₆: 81 (F_1u), 83 (F_2g).