Registry No. BrMn(CO)s, 14516-54-2; ClMn(CO)s, 14100-30-2; IMn(CO)s, 14879-42-6; ds-BrMn(CO)4-(CNCH3), 37474-14-9. Acknowledgments. The authors wish to acknowledge Dr. P. M. Treichel and his research group for supplying samples of the pentacarbonylmanganese halides. We are especially grateful to Dr. G. E. Dirreen for supplying the sample of Mn(CO)4(CNCH3)Br. We are grateful to Dr. A. F. Orchard for informing us of the presence of the 9a2 band and useful discussions. This work was supported by the National Science Foundation (Grant GP-27636) and the Wisconsin Alumni Research Foundation. D. L. L. acknowledges an NDEA Title IV fellowship (Grant 69-03546.1).
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