Formation of a layered framework structure based upon 4-methyl-2,6-bis(methylphosphonic acid) phenol
作者:Xin-min Gan、Iris Binyamin、Sylvie Pailloux、Eileen N. Duesler、Robert T. Paine
DOI:10.1039/b603987a
日期:——
The trifunctional ligands, [(HO)2P(O)CH2]2C6H2(R)OH, (5-H4)
(R = CH3, Br) were prepared in good yield via an Arbusov reaction between P(OEt)3 and the respective 4-R-2,6-bis(chloromethyl)phenols followed by acidic aqueous hydrolysis and they were spectroscopically characterized by IR and NMR techniques. The ligand 5-H4–CH3 readily dissolves lanthanide hydroxide residues and it forms a crystalline complex from aqueous LaCl3 solutions. This complex was characterized by single crystal X-ray diffraction methods and found to adopt a complex 2-D lamellar network in the bc plane. The La(III) inner coordination sphere is seven coordinate formed by oxygen atoms from two water molecules and five phosphonate oxygen atoms from three different ligands. The phenolic oxygen atom is not involved in the ligand binding to La(III).
通过 P(OEt)3 与相应的 4-R-2,6-双(氯甲基)苯酚之间的阿勃梭夫反应,然后进行酸性水水解,制备了三功能配体 [(HO)2P(O)CH2]2C6H2(R)OH, (5-H4) (R = CH3, Br),并利用红外和核磁共振技术对其进行了光谱表征。配体 5-H4-CH3 很容易溶解氢氧化镧残基,并在 LaCl3 水溶液中形成结晶络合物。利用单晶 X 射线衍射方法对这种复合物进行了表征,发现它在 bc 平面上形成了复杂的二维片状网络。La(III) 的内配位球是由两个水分子的氧原子和三个不同配体的五个膦酸氧原子形成的七个坐标。酚氧原子不参与配体与 La(III)的结合。