A novel five-coordinated silver complex {[Ag(HPPz)4(NO3)](NO3)4} [PPzZtrans-2-(2-phenylethenyl)pyrazine]: Self-assembly of supramolecular architecture based on NOK3 anions

The title complex {[Ag(HPPz)4(NO3)](NO3)4}, 1, has been prepared from the reaction of trans-2-(2-phenylethenyl)pyrazine (PPz) with AgNO3 at room temperature in 10% HNO3 and structurally determined by single-crystal X-ray diffraction analysis. The result shows that the AgI center is five-coordinated with one NOK3 anion and four mono-protonated HPPzC ligands. The NOK3 anions display versatility not only participating in coordination, but also linking the HPPzC ligands by electrostatic and hydrogen bond interactions. The final framework can be considered as a 3D supramolecular architecture built up by the self-assembly of the building blocks ([Ag(HPPz)4(NO3)]3C, NOK3 ), driven by diverse interactions based on the NOK3 anions. q 2005 Elsevier B.V. All rights reserved