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A solution of deprotonated 1,3-bis(4-bromophenyl)triazene reacts with Hg(CH 3 COO) 2 in methanol / tetrahydrofurane to give yellow crystalline needles of {Hg II [NNN(PhBr) 2 ] 2 } n , a triazenide complex polymer of Hg II with metal-η 2 ,η 2 -arene π-interactions, performed by coordinated single triazenide chains. The crystal structure of the new polymeric complex of Hg II belongs to the monoclinic space group P2 615[Hg II (BrPhNNNPhBr) 2 ] n can be viewed as a one-dimensional assembling of planar tectons [Hg II (BrPhNNNPhBr) 2 ] linked through metalocene alike Hg II -η 2 ,η 2 -arene π-interactions along the crystallographic b axis.

A solution of 1,3-(4-nitrophenyl)triazenein methanol treated with potassium hydroxide yields dark-red crystalline blocks of {[K(O 2 NC 6 H 4 NNNC 6 H 4 NO 2 )] 2 } n , a triazenide complex polymer of potassium. The centrosymmetric binuclear entities are connected by weak intermolecular K···O interactions, and are related to chains by translation along the [010] crystallographic direction.

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In the title complex, [Au(C(12)H(8)N(5)O(4))(C(18)H(15)P)], the coordination geometry about the Au(I) ion is linear, with one deprotonated 1,3-bis(4-nitrophenyl)triazenide ion, [O(2)NC(6)H(4)N=N-NC(6)H(4)NO(2)](-), acting as a monodentate ligand (two-electron donor), and one neutral triphenylphosphine molecule completing the metal coordination. The triazenide ligand is almost planar (r.m.s. deviation = 0.0767 A), with the largest interplanar angle being 11.6 (7) degrees between the phenyl ring of one of the terminal 4-nitrophenyl substituents and the plane defined by the N=N-N triad. The Au-N and Au-P distances are 2.108 (5) and 2.2524 (13) A, respectively. Pairs of molecules generated by centrosymmetry are associated into a supramolecular array via intermolecular C-H...O interactions, and N...C and N...O pi-pi interactions.