New crystalline coordination networks based on Ag(i) and N-bridging ligands — pyrazine (pyz), 4,4′-bipyridine (bpy), and 2,3-bis-(2-pyridyl)pyrazine (bppz) — incorporating carborane monoanions (CB₁₁H₁₂)^- or [Co(C₂B₉H₁₁)₂]^- were isolated and characterized using single crystal X-ray diffraction, microanalysis, and infrared spectroscopy. All the complexes with the bpy and bppz ligands reveal 1D coordination infinite chains involving the Ag(i) and the ligands, and layered extended structures with rows of carborane anions between the layers of chains. Interestingly, two polymorphs of the complex [Ag(bpy)(CH₃CN)][Co(C₂B₉H₁₁)₂] were observed. The complex [Ag(pyz)(CH₃CN)₂][Co(C₂B₉H₁₁)₂] shows a 1D coordination polymer, while the pyz complex with the smaller carborane anion {[Ag(pyz)](CB₁₁H₁₂)} exhibits a 3D coordination network structure with four Ag···H-B interactions between the silver centre and carborane anions.