METAL-ORGANIC COORDINATION POLYMERS OF LANTHANIDES(III) WITH THIENOTHIOPHENDICARBOXYLATE LIGANDS

摘要

Three novel metal-organic coordination polymers based on sulfur-containing thieno[3,2-b]thiophene-2,5-dicarboxylic (trans-H(2)ttdc) and thieno[2,3-b]thiophene-2,5-dicarboxylic (cis-H(2)ttdc) acids are obtained: [Ce-2(DMF)(4)(trans-ttdc)(3)]center dot 2DMF (1), [Dy-2(DMF)(4)(trans-ttdc)(3)]center dot 4DMF (2), and [Tb-2(DMF)(4)(cis-ttdc)(3)]center dot 2.5DMF (3). Structures of the products are determined by single crystal X-ray diffraction. The compositions and nature of compounds 2 and 3 are confirmed by IR spectroscopy, elemental and thermogravimetric analyses. All three compounds are based on binuclear {Ln(2)(DMF)(4)(RCOO)(6)} units organized into 3D frameworks with primitive cubic topology pcu by linear organic linkers. The specific void volume in the structures of 1-3 ranges from 29% to 37%.