deionized water. A faster interconversion rate was observed for both isomers with lower concentrations of ammonium ions. At the end of reaction, the thermodynamic Cu1a to Cu1b equilibrium ratio was 6:94. The particular energy barriers of the interconversion for Cu1a and Cu1b were 130 kJ mol−1 and 140 kJ mol−1. Spectrophotometric measurements with Cu1a and Cu1b revealed two isomers adopting different geometrical
[ 64 Cu((S)-p -NH 2 -Bn-NOTA)] -([ 64 Cu] 1)模型配合物用于研究[ 64 Cu-NOTA-Bn]标记的放射性示踪剂的异构性。在[ 64 Cu] Cu 2+与(S)-p -NH 2 -Bn-NOTA络合过程中,两种复杂的异构体[ 64 Cu] 1a和[ 64 Cu] 1b的形成比例为1:9 。用离子对色谱法分离。为了研究相互转换,非放射性复合异构体Cu 1a分离出Cu 1b和Cu 1b并在
乙酸铵溶液和去离子
水中于90°C进行热处理。对于具有较低
铵离子浓度的两种异构体,观察到较快的相互转化率。反应结束时,Cu 1a与Cu 1b的热力学平衡比为6:94。Cu 1a和Cu 1b的互变的特定能垒为130 kJ mol -1和140 kJ mol -1。用Cu 1a和Cu 1b进行分光光度测量,发现两种异构体采用不同的几何构型。