This is a bit of an unusual literature discussion that requires some background information. At the time of writing this, I was preparing to co-teach a CURE with my computational colleague. During the synthesis portion of the lab, students will be preparing compounds that are closely related to those presented in this paper. As a means of an introduction, I wanted students to read something relevant in the literature. Students in this class will range from having never taken an Inorganic course to having taken two Inorganic courses. As such, I could not choose a paper with too much assumed knowledge (hence not asking students to do group theory for example). Looking through the literature, most of these compounds have been known for quite some time. As such, finding papers that contained both multinuclear NMR data and IR data proved to be somewhat challenging. In the CURE, our first means of characterizing products is going to be ³¹P NMR and so introducing that concept was an absolute must. In addition, the paper had to provide an opportunity to explore a little bit about the bonding in transition metal carbonyls. Given the parameters, I think this paper fits very nicely with my goals.