The title compound and its potassium analog have been prepared from corresponding aqueous solutions of 99TcO at pH ≈ 2 with SO2 as a reducing agent. An X-ray structure determination of the Na-salt showed Tc coordinated to the tetradentate N(CH2COO) ligand (NTA). Two Tc-NTA moieties are joined via two bridging O-atoms into a four-membered Tc2O2 ring. The observed diamagnetism, a strong absorption band
由相应的99 TcO
水溶液在pH≈2下,以SO 2为还原剂,可以制备标题化合物及其
钾类似物。钠盐的X射线结构测定表明Tc与四齿N(CH 2 COO)
配体(
NTA)配位。两个Tc-
NTA部分通过两个桥接O原子连接到一个四元Tc 2 O 2环中。具有强
金属-
金属相互作用的Tc 2 O 2碎片通常具有观察到的反磁性,在19 950 cm -1处具有很强的吸收带和2.363Å的Tc-Tc短距离。结构反式-在Tc处的影响和氢键网络与氧化态IV下的Tc一致。