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In the title complex, [ZnCl2(C14H12N4)], ZnII is pentacoordinated by three N-atom donors from one 2-[3-(2-pyridyl)pyrazol-1-ylmethyl]pyridine ( L) ligand and by two Cl− anions in a distorted trigonal–bipyramidal geometry. Adjacent mononuclear ZnII complexes form π–π stacking interactions between pyridine and pyrazole rings of neighbouring L ligands, with centroid–centroid separations of 3.671 (1) and 3.681 (1) Å, generating one-dimensional chains. [ABSTRACT FROM AUTHOR]

In the title co-crystal, C10H11NO2·C10H13NO2, the carboxyl­ic acid moiety uses its acid H atom as the donor atom to bind strongly to the negatively charged O atom of the zwitterionic moiety [O⋯O = 2.557 (2) Å]. Meanwhile, the protonated N atom of the zwitterionic moiety forms a hydrogen bond with the double-bonded O atom of an adjacent zwitterionic moiety [N⋯O = 2.703 (2) Å] to give rise to a linear chain motif. The butenyl substituent (on the zwitterion) is disordered with respect to a butyl group and the butyl substituent (on the neutral mol­ecule) is disordered with respect to a butenyl group, the site occupancy for both being in an approximate 0.6:0.4 ratio. [ABSTRACT FROM AUTHOR]

The title compound, C12H14O4, contains two mol­ecules in the asymmetric unit, each with an intramolecular O—H⋯O hydrogen bond. [ABSTRACT FROM AUTHOR]