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Space-filling models of the dimetallic bis(3-pyridyl)diethynylbenzene cores of four coordination complexes generated from crystallographic coordinates: (a) [Cu2(μ-I)2(Et2BCQEBEt)];9 (b) [FeNa(μ-O2CTrp)3(PIC2DET)];10 (c) [Fe2(μ-O2CArTol)3-(Et2BCQEBEt)](OTf);9 (d) [Fe2(μ-OTf)2(PIC2DET)2](BARF)2 (2). Approximate metal-metal distances are listed below each model.
