A zinc phosphate possessing ladder-like layers made up of three- and four-membered rings and infinite Zn-O-Zn chains

A new open-framework zinc phosphate, [NH3(CH2)(2)NH(CH2)(2)NH3](2+)2[Zn2PO4 (HPO4)](-), possessing a layered architecture and consisting of alternating inorganic and organic layers, stabilized by multipoint hydrogen bonding ha s been synthesized hydrothermally, It has the following crystal data: monoc linic space group C2/c, a = 25.075(5) Angstrom, b = 5.127(1) Angstrom, c = 17.726(4) Angstrom, beta = 125.4(1)degrees, V = 1857.6(6) Angstrom(3), Z = 8, M = 748.3(1), D-calc = 2.06 g cm(-3), MoK alpha, and R-F = 0.04. The str ucture is made up of ZnO4 and PO4 tetrahedra linked though vertexes, The co nnectivity between the two units creates a layered structure with steps, th e layers consisting of three- and four-membered rings only. This is the fir st; instance of such a network in open-framework zinc phosphates. The exclu sive presence of three-membered ring chains creates steps in the layers as well as an infinite number of Zn-O-Zn one-dimensional chains. Hydrogen bond interactions between the inorganic layers give rise to pseudo 10-membered ring channels, in which the diprotonated diethyelenetriamine molecules resi de. The unusual T atom (T being Zn or P) connectivity in this material sugg ests the possibility of synthesizing many such materials with novel connect ivities and networks.