A k1-dppe (Ph2PCH2CH2PPh2) ligand, for example, has only one of the two phosphorus donors bonded to the transition metal center.
George G. Stanley
<a rel="nofollow" class="external free" href="http://chem-faculty.lsu.edu/stanley/webpub/4571-full-notes-Fall-2008.pdf">http://chem-faculty.lsu.edu/stanley/webpub/4571-full-notes-Fall-2008.pdf</a>