Application of 13395-16-9, One of the major reasons for studying chemical kinetics is to use measurements of the macroscopic properties of a system, such as the rate of change in the concentration of reactants or products with time.Mentioned the application of 13395-16-9.
Synthesis and crystal structure of tetra- and hexanuclear uranium(IV) complexes with hexadentate compartmental Schiff-base ligands
Treatment of UCl4 with the hexadentate Schiff bases H 2L? in thf gave the expected [UL?Cl2(thf)] complexes [H2L? = N,N?-bis(3-methoxysalicylidene)-R and R = 2,2-dimethyl-1,3-propanediamine (i = 1), R = 1,3-propanediamine (i = 2), R = 2-amino-benzylamine (i = 3), R = 2-methyl-1,2-propanediamine (i = 4), R = 1,2-phenylenediamine (i = 5)]. The crystal structure of (UL4Cl 2(thf)] (4) shows the metal in a quite perfect pentagonal bipyramidal configuration, with the two Cl atoms in apical positions. Reaction of UCl 4 with H4L? in pyridine did not afford the mononuclear products [U(H2L?)Cl2(py)x] but gave instead polynuclear complexes [H4L? = N,N?-bis(3-hydroxysalicylidene)-R and R = 1,3-propanediamine (i = 6), R = 2-amino-benzylamine (i = 7) or R = 2-methyl-1,2-propanediamine (i = 8)]. In the presence of H4L6 and H4L7 in pyridine, UCl4 was transformed in a serendipitous and reproducible manner into the tetranuclear U(IV) complexes [Hpy]2[U 4(L6)2(H2L6) 2Cl6] (6a) and [Hpy]2[U4(L 7)2(H2L7)2Cl 6][U4(L7)2(H2L 7)2 Cl4(py)2] (7), respectively. Treatment of UCl4 with [Zn(H2L6)] led to the formation of the neutral compound [U4(L6) 2(H2L6)2Cl4(py) 2] (6b). The hexanuclear complex [Hpy]2[U 6(L8)4Cl10(py)4] (8) was obtained by reaction of UCl4 and H4L8. The centrosymmetric crystal structures of 6a¡¤2HpyCl¡¤2py, 6b¡¤6py, 7¡¤16py and 8¡¤6py illustrate the potential of Schiff bases as associating ligands for the design of polynuclear assemblies.
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Reference£º
Copper catalysis in organic synthesis – NCBI,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”