| http://www.w3.org/ns/prov#value | - Preferably, Q is present and is a bridging group containing at least one Group 13, 14, 15, or 16 element, in particular boron or a Group 14, 15 or 16 element, and Q can be bonded to any bondable ring position of J and E. Examples of suitable bridging groups include P(???S)R???, P(???Se)R???, P(???O)R???, R???2C, R???2Si, R???2Ge, R???2CCR???2, R???2CCR???2CR???2, R???2CCR???2CR???2CR???2, R???C???
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