In the square-planar complex anion [trans-Ag(CF₃)₂(CN)₂]−, the AgeCN groups are collinear.

(a) Assume free rotation of the CF₃ groups (that is, disregarding the AgCF and AgCH angles) and name the point group of this complex ion.

(b) Now suppose the CF₃ groups cannot rotate freely (because the ion was in a solid, for example). Structure (5) shows a plane which bisects the NCeAgeCN axis and is perpendicular to it. Name the point group of the complex if each CF₃ group has a CF bond in that plane (so the CF₃ groups do not point to either CN group preferentially) and the CF₃ groups are (i) staggered, (ii) eclipsed.

Transcribed Image Text:

CN Ag 5 CF₂ 3 CF3 CN