ChemInform Abstract: Two Closely Related Intersecting Tunnel Structures: The Monophosphates K3V1.4W2.6O9 (PO4)2 and K3Nb3WO9(PO4)2.
Abstract
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ChemInform Abstract
Single crystals of the title compounds are grown from mixtures of nominal compositions K5V1.7W1.7P1.6O15 and K4Nb2W2P2O17. The structures of the V compound (space group P21/m, Z = 2) and the Nb compound (space group Pnma, Z = 4) are determined by powder XRD. The size of the cages and tunnels in these frameworks allow the insertion of larger cations than K+, e.g. Rb+, Tl+, Cs+. The magnetic study of the mixed valent monophosphate K3V2W2O9 (PO4)2 evidences electronic localization despite the existence of [MO3]∞ chains.
