Blue-, Green- and Non-luminescent Crystals from One Reaction. Isolation and Structural Characterization of a Series of Gold(I)-Siver(I) Heterometallic Complexes Utilizing a Gold Carbene Metalloligand Containing Free Amino Groups

The metalloligand [Au{C(NHMe)(NHCH2CH2NH2)}(2)]Cl, 1, has been prepared by the reaction of ethylenediamine with [Au(CNMe)(2)]Cl. Compound 1 crystallized as a luminescent dimer with a Au center dot center dot center dot Au separation of 3,0224(4) angstrom. It reacted in solution with silver hexafluorophosphate to form the coordination polymer, {[Au[mu-C(NHMe)(NHCH2CH2NH2)}(2)Ag (NCme)](PF6)(2)}(n), 2. The structure of 2 involves a chain of alternating gold(I) and silver(I) ions with a Au center dot center dot center dot Ag distance of 2.9694(4) angstrom. The reaction of the metalloligand, 1, with silver tetrafluoroborate yielded three products: the green luminescent coordination polymer, {[Au{mu-C(NHMe)(NHCH2CH2NH2)}(2)Ag-(NCMe)](BF4)(2)}(n), 3, which is analogous to 2; the non-luminescent binuclear complex, [Au{mu-C(NHMe)(NHCH2CH2NH2)}(2)Ag](BF4)(2), 4; and the blue luminescent complex, [{mu-C(NHMe)NHCH2CH2NH(MeHN)C}Au-2{mu-C(NHMe)(NHCH2CH2NH2)}(2)Ag](BF4)(3-) center dot 3(MeCN), 5. Compound 5 involves a bent Au center dot center dot center dot Ag center dot center dot center dot Au cation with two different Au center dot center dot center dot Ag distances (2.9165(8) angstrom and 3.1743(8) angstrom). This cation self-associates through a Au center dot center dot center dot Au interaction of 3.0275(5) angstrom, which allows the formation of an extended zigzag chain of cations in 5.