| http://www.w3.org/ns/prov#value | - le of Elements, and halogen radicals; or (C5H5-y-xRx) is a cyclopentadienyl ring in which two adjacent R-groups are joined forming a C4-C20 ring to give a polycyclic cyclopentadienyl ligand;(JR'z-1-y) is a heteroatom ligand in which J is an element in with a coordination number of three from Group V-A or an element with a coordination number of two from Group VI-A of the Periodic Table of Elements
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