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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 (F1u), 90 (F2g); Mo(CO)6: 81 (F1u), 81 (F2g); W(CO)6: 81 (F1u), 83 (F2g).
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McDowell et al. (1962) studied this question.
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