C17H16N5O5Zn, monoclinic, C12/c 1( no. 15), a =2 3.87(1) A, b =9 .887(4) A, c =1 8.929(9) A, * =1 26.840(5)°, V =3 575.3 A 3 , Z =8 , Rgt(F) =0 .046, wRref(F 2 ) =0 .152, T =2 98 K. Source of material The title complex was obtained from the mixture of Zn(NO3)2 · 6H2 O( 0.075 g, 0.25 mmol), 5-methyl-2-pyrazinecarboxylic acid (2mpac, 0.067 g, 0.5 mmol), 4,4'-bipyridine (4,4'-bpy, 0.071 g, 0.5 mmol) and distilled water (8 mL), which was placed in aT eflon-lined stainless steel Parr bomb at 393 Kf or three days. After slowly cooling to room temperature, colorless single crystals were obtained (yield 39 %).