Substitution Reaction of Molybdenum Hexacarbonyl: the Use of Infrared Spectroscopy as a Structural Tool in Metal Carbonyl Chemistry.

Topics: Infrared spectroscopy, Infrared, Redox Pages: 4 (758 words) Published: April 13, 2013
School of Chemistry @ Pietermaritzburg

University of KwaZulu Natal
Chemistry 310

Substitution reaction of Molybdenum Hexacarbonyl: the use of infrared spectroscopy as a structural tool in metal carbonyl chemistry.

Abstract

The synthesis of isomer A and B of [Mo(CO)4(PPh3)2] were prepared from molybdenum hexacarbonyl, sodium borohydride and triphenylphosphine with a % yield of 79% and 8.5% respectively. Two isomer was identified using IR spectra and from isomer A four C≡O stretching was observed, while in isomer B only one C≡O stretching was observed in a frequency ranged of (1867.24- 2024,39 cm-1) and 1880.91 cm-1 through this results isomer A concluded to be cis and B to be trans isomer .

Results discussion

|Isomer A |Isomer B | | | | |Isomer A was obtained as a very fine, light yellow, crystalline |Isomer B was obtained as a fine, pale yellow powder. | |powder. |Mass of Isomer B Produced: 0.0424 g | |Mass of Isomer A Produced: 1.102 g | | |Mass of [Mo(CO)6] Used: 0.5000 g |Mo(CO)4(PPh3)2 (Isomer A) → Mo(CO)4(PPh3)2 (Isomer B) | |n = m/Mr | | |= 0.5000 g /264.00 g/mol |Since isomer A and B are geometric isomers, the data from isomer A can| |= 1.893×10-3 mol |be used for...
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