state and gas-phase structures recently noted for (CH3)3N-S0227 (0.21 Á) is encouraging in this respect, as it demonstrates the possibility of a substantial "dynamic range" in N-S bond lengths. ConclusionMicrowave spectroscopy has been used to observe the gas-phase adduct formed between CH3CN and BF3. The structure has been determined to be intermediate between the limits normally expected for van der Waals and covalent interactions and is significantly different from that observed in the crystalline material. The correlation between the boron-nitrogen bond length and the N-B-F angle in a series of BX3 species with nitrogen donors provides the first gas-phase example of a structure correlation analogous to those used frequently to map reaction paths in crystalline systems.Acknowledgment. The support of the National Science Foundation (Grant No. CHE-8807895) and the McKnight Foundation is gratefully acknowledged. We are also grateful to Ms. Robin Jurgens-Lutovsky and Prof. Jan Alrnlof for making the results of their ab initio study known to us prior to publication and to Prof. R. L. Kuczkowski for providing us with a preprint of his work on (CH3)3N-S02.

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