Syntheses and Coordination Structures

Two terminal phosphine oxides of Eu(hfa)3(dpppo) are located on the upper square of 9-SAP, while those of Eu(hfa)3(dpbtpo) are attached to the upper and lower squares of 9-SAP. The author thus considers that the coordination structures of Eu(lll) complexes with tridentate phosphine oxide ligands are markedly influenced by the moiety between the phosphine oxides. 

Based on the X-ray single crystal analyses, the author carried out calculations of charge densities of phosphorus atoms by using DFT calculation (6-31G(d)/ B3LYP). According to the calculation, charge densities of phosphorus atoms were 

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