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In the title compound, [Co(C11H8N5O)Cl]n, the CoII atom is pentacoordinated by one O atom and two N atoms from a 5-(8-quinolyloxymethyl)tetrazolate ligand, one N atom from another symmetry-related ligand, and a Cl atom. The coordination geometry can be described as slightly distorted trigonal–bipyramidal. Adjacent Co atoms are connected by the bridging tetrazole groups into a chain. The dihedral angle between the quinoline and tetrazole planes is 21.2 (1)°. The structure involves intra- and interchain C—H...N hydrogen bonds.