... Acknowledgment.-The authors are grateful to W. L. Brown, GM Maciak, HL Hunter, and RM Hughes for the microanalyses, to Dr. HE Boaz and D. 0. Woolf for physical-chemical data, and to Z. Frank, T. Lenahan, D. Caldwell, and P ... (12) WC Wilson and R. Adams, J . Am. Chem. ...