Cadmium(II) Complexes of 1, 3-Propanediamine with 2-Thiouracil and its 6-Methyl Derivative
                                
                                    
                                        作者:A. R. Sarkar、M. Sarkar                                    
                                    
                                        DOI:10.1080/00945719809351653
                                    
                                    
                                        日期:1998.1
                                    
                                    Four cadmium(ll) complexes containing four-membered N,S-chelates, [Cd(Htuc)(pn)(2)](+) and [Cd(tuc)(pn)(2)] (H(2)tuc = 2-thiouracil or 6-methyl-2-thiouracil, pn = 1,3-propanediamine), have been prepared by reacting Cd(pn)(2)Cl-2 with 2-thiouracil or its 6-methyl derivative in aqueous methanol. The relative lowering of the (C=O) frequencies and the increase of the ring frequencies of the complexes compared to the free ligands have been assigned due to N(3) and S coordination. The downfield shift of the C-13 NMR signal due to the C(6) carbon atom of the complexes containing the tuc(2-) ligand compared to the complexes containing the Htuc(-) conclusively proves the chelation through its N(3) and S donor atoms.