Further refinements of some rigid boron compounds

A number of suitable rigid-molecule structures of boron compounds have been refined primarily to test a method of constraining the anisotropic temperature factors to agree with rigid motion. The structures reported have a wide range of success and should serve as a basis for comparing later work. In addition to giving greater accuracy in estimating the rigid molecular motion, the method yields more reliable bond lengths for the same initial data and a considerable economic advantage. All significant improvements are listed and also the new corrected bond lengths, which should be of interest in theoretical boron chemistry.