ChemInform Abstract: The First Tetradentate μ‐1ϰ2:2ϰ2‐Sn2Se6 Ligand to a Lanthanide(III) Center: Solvothermal Syntheses and Characterizations of Lanthanide Selenidostannate Polymers with Tetraethylenepentamine as a Second Ligand. Issue 4 (31st January 2013)