A New Class of Macrocyclic Lanthanide Complexes for Cell Labeling and Magnetic Resonance Imaging Applications
作者:Quan Zheng、Houquan Dai、Matthew E. Merritt、Craig Malloy、Cai Yuan Pan、Wen-Hong Li
DOI:10.1021/ja054593v
日期:2005.11.23
Lanthanidecomplexes have wide applications in biochemical research and biomedical imaging. We have designed and synthesized a new class of macrocyclic lanthanide chelates, Ln/DTPA-PDA-C(n), for cell labeling and magneticresonanceimaging (MRI) applications. Two lipophilic Gd3+ complexes, Gd/DTPA-PDA-C(n) (n = 10, 12), labeled a number of cultured mammalian cells noninvasively at concentrations as
Large pKa Shifts of ?-Carbon Acids Induced by Copper(II) Complexes
作者:Zhenlin Zhong、Brenda J. Postnikova、Robert E. Hanes、Vincent M. Lynch、Eric V. Anslyn
DOI:10.1002/chem.200400396
日期:2005.4.8
A series of synthetic receptors (4-6) incorporating metal ions, specifically copper(II), were examined for their ability to enhance the acidity of active methylene compounds. The copper(II) complexes were observed to reduce the pKa of 1,3-diketone carbon acids in acetonitrile by as much as 12 pKa units. The relatively large pKa reduction achieved by the complex is attributed to the electrostatic interaction