Abstract
Organic-inorganic hybrid of 3d-4f heterometallic derivatives of lacunary Keggin type silico- and germano-tungstates: [{Cu-2(1,10-phen)(2)(mu-CH(3)C00)(2)}Ln(alpha-XW11O39)(2)](11-/10-) {Ln = La-III, ce(III) and Ce-IV, X = Si-IV; La-III, Ce-III, Ce-IV, X = Ge-IV; 1,10-phen = 1,10-Phenanthroline} have been synthesized by conventional aqueous solution method under mild reaction conditions. Solid crystalline materials isolated from the solution as an alkali salts (Na+/K+) are characterized by single crystal X-ray diffraction, FT-IR spectroscopy, powder-XRD, ICP-AES, liquid UV/vis and thermogravimetric analysis. FT-IR spectra and PXRD suggest that these compounds are isomorphous. Further, single crystal XRD analyses show that all are organic-inorganic hybrids comprising Peacock and Weakley type sandwich-type [Ln(alpha-XW11O39)(2)](13-/12-) (X = Si-IV and Ge-IV) polyanion as the fundamental building block unit. These sandwich type species form polymeric chain assistance with copper organic complexes. These polymeric chains further assemble into 2-D structures by pi-pi stacking.