Abstract: A unique semiconductive, polymeric material capable of use for example as a humidity sensing detector or as an electrical "rectifying-type" element created by pressure treating an oxidized coordination polymer formed from a polydentate organic ligand, such as for example 1,2,4,5-tetraaminobenzene, and a metal salt, such as for example nickle(II) chloride, palladium(II) chloride, or platinum(II) chloride. The element is mounted on a non-conducting base, electrical leads are attached to the element, and the wired element is placed in an electrical circuit capable of for example detecting electrical resistance. The presence of water vapor in the atmosphere about the element elicits rapid, reversible, reproducible changes in the resistance of the element. The wired element can also be used as a "rectifyer-type" element in that it has an electrical polarization which is not instantaneously reversible with a change in voltage polarity.