A compound of formula MOL-M-L, wherein M is a 5 or 6-coordinate metal, L is a bidentate ligand, and MOL is a compound of formula (II): (II) wherein X is C and R R2, R3, R4, R5, R6, R7, R8, R9, R10, R11 and R12 are as defined herein. In another embodiment, a system comprises a substrate and a compound of the present disclosure immobilized on the substrate. In still another embodiment, a method comprises introducing a reagent to a substrate presenting the compound of the present disclosure.
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