A new cyanoscorpionate ligand, hydrotris(3-t-butyl-4-cyanopyrazolyl)borate (Tp(t-Bu,4CN)) is reported. Both Tp(t-Bu,4CN) and hydrotris(4-cyano-3-phenylpyrazolyl)borate (Tp(Ph,4CN)) form one-dimensional coordination polymers with Cu(I). The polymeric chains align to form channels which, in the case of Tp(t-Bu,4CN), can encapsulate solvent molecules, as evidenced by the characterization of one such polymer with encapsulated acetonitrile molecules.