Two novel 2D organic-inorganic hybrid lacunary Keggin phosphotungstate 3d-4f heterometallic derivatives: [Cu(en)2]2H6[Ce(α-PW11O39)2]•8H2O and [Cu(dap)2(H2O)][Cu(dap)2]4.5[Dy(α-PW11O39)2]•4H2O

The reaction of 2(NH4)(2)SO4Ce(SO4)(2)center dot 2H(2)O or DyCl3 with CuCl2 center dot 2H(2)O, Na-9[A-alpha-PW9O34]center dot 7H(2)O in the presence of ethylenediamine (en) or 1,2-diaminopropane (dap) under hydrothermal conditions led to two novel 2D organic-inorganic hybrid monovacant Keggin phosphotungstate 3d-4f heterometallic derivatives [Cu(en)(2)](2)H-6 [Ce(alpha-PW11O39)(2)]center dot 8H(2)O (1) and [Cu(dap)(2)(H2O)][Cu(dap)(2)](4.5)[Dy(alpha-PW11O39)(2)]center dot 4H(2)O (2), which were structurally characterized by elemental analyses, IR spectra, powder X-ray diffraction (PXRD) and single-crystal X-ray diffraction. 1 displays an interesting 2D 3d-4f heterometallic sheet architecture with a 4-connected topology constructed from 1:2-type [Ce(alpha-PW11O39)(2)](10 -) subunits and [Cu(en)(2)](2+) bridges whereas 2 illustrates the other unique 20 3d-4f heterometallic sheet with a 5-connected topology established by 1:2-type [DY(alpha-Pw(11)O(39))(2)](11-) subunits and [Cu(dap)(2)](2+) bridges. To the best of our knowledge, 1 and 2 represent scare organic-inorganic hybrid 2D 3d-4f heterometallic monovacant Keggin phosphotungstates. Moreover, the solid-state photoluminescence of 2 was investigated. (C) 2010 Elsevier B.V. All rights reserved.