Effect of Mixed Pendent Groups on the Solution and Catalytic Properties of Europium(III) Macrocyclic Complexes: Bifunctional and Monofunctional Amide and Alcohol Pendents in Septadentate or Octadentate Ligands
作者:Lara L. Chappell、David A. Voss,、William DeW. Horrocks,、Janet R. Morrow
DOI:10.1021/ic980191v
日期:1998.8.1
10(-)(6) s(-)(1), respectively. Both Eu(CNPHC)(3+)and Eu(ABHC)(3+) promote attack of an hydroxyethyl group of the macrocycle on bis(4-nitrophenyl) phosphate with pseudo-first-order rate constants at pH 7.3, 37 degrees C, and 1.00 mM complex of 1.5 x 10(-)(4) and 3.5 x 10(-)(5) s(-)(1), respectively. In general, an increase in the number of amide groups on the macrocycle of the Eu(III) complex decreases the
已经制备了五种新的Eu(III)大环配合物,并研究了它们的溶液和催化性能。具有分开的配体TRED和NB-TRED的Eu(III)配合物在pH 7.4、37°C(TRED = 1,4,7-三(羟乙基)-1,4,7,10-四氮杂环十二烷,NB-TRED)下迅速解离= 1-(硝基苄基)-4,7,10-三(羟乙基)-1,4,7,10-四氮杂环十二烷)。在存在和不存在强结合竞争性配体的情况下确定的解离速率表明,在大多数条件下,ATHC,ABHC和CNPHC的Eu(III)配合物比包含所有羟乙基的Eu(III)配合物在动力学上对惰性更惰性。 (ATHC = 1-(氨基甲酰基甲基)-4,7,10-三(羟乙基)-1,4,7,10-四氮杂环十二烷,ABHC = 1,7-双(氨基甲酰基甲基)-4,10-双(羟乙基)- 1,4,7,10-四氮杂环十二烷 CNPHC = 1-(1-羧酰胺基-3-(4-硝基苯基)丙基)-4