| http://www.w3.org/ns/prov#value | - Clathrates and inclusion compounds (some of which retain permanent porosity upon removal of the guest molecules): Werner complexes of the form MX2A4 where M is a divalent cation (Fe, Co, Ni, Cu, Zn, Cd, Mn, Hg, Cr), X is an anionic ligand (NCS???, NCO???, CN???, NO3 ???, Cl???, Br???, I???), and A is an electrically neutral ligand-substituted pyridine, alpha-arylalkylamine or isoquinoline, example
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