Crystal structure of a new complex of [3-(1 H -benzimidazol-yl)propionato- N ][3-(1 H -benzimidazol-yl) propionic acid- N ]silver(I), C20H19AgN4O4

The silver and acid hydrogen atoms in the crystal structure of Ag(pa)(Hpa)] _n (Hpa?=?3-(1H-benzimidazol-2-yl) propionic acid-N) both lie on special positions of ?1 site symmetry; the silver atom shows linear coordination Ag–N?=?2.109(3)?Å, N–Ag–N?=?180°]. The ‘acid hydrogen’ links molecules into a linear chain, and hydrogen bonds between the nitrogen-bound hydrogen atom and the carbonyl oxygen atom of an adjacent chain furnish a three-dimensional supramolecular structure. The compound, C₂₀H₁₉AgN₄O₄, belongs to the triclinic space group P 1 a?=?6.536(7), b?=?8.127(9), c?=?9.051(1)?Å; α?=?81.692(2), β?=?82.819(2), γ?=?87.229(2)°], and there is one formula unit in the unit cell.