Search for the shortest intermetallic Tl---Tl contacts: Synthesis and characterization of Thallium(I) coordination polymers with several mono- and bis-cyanoximes
作者:Scott Curtis、Brett Lottes、Daniel Robertson、Sergey V. Lindeman、Nikolay Gerasimchuk.
DOI:10.1016/j.ica.2020.119597
日期:2020.8
phenylcyanoxime – HPhCO, 1, 2-fluorophenylcyanoxime – H(2F-PhCO, 2, 3-fluorophenylcyanoxime – H(3F-PhCO), 3, of TlL composition, and aryl biscyanoximes, such as 1,3-cyanoxime (benzene) – H2(1,3-BCO, 4 and 1,4-cyanoxime (benzene) – H2(1,4-BCO), 5 of Tl2L stoichiometry were synthesized and characterized using spectroscopic methods, thermal stability studies, and X-ray analysis. All obtained complexes
形成锯齿形和梯形聚合物,其中观察到的亲嗜性T1-T1距离非常短。因此,在Tl2(1,3-BCO)的结构中,金属中心之间的最接近距离为3.670A。这是非有机金属和非簇结构中第二个最短的有记录金属间接触,但为Werner型配合物,并且接近金属th:3.456A。在所有五种新的配位聚合物中,中心原子均具有立体活性6 s2孤对,从而显着扭曲Tl(I)配位多面体的形状。首次在获得的配合物的拉曼光谱中观察到了Tl2O2菱形中的Tl–O振动。热分析研究证明所有配合物(但Tl(PhCO))在约200°C的温度下均具有稳定性。Tl2(1,3-BCO)化合物证明了高能化合物的特性,在约255°C时剧烈放热分解,并释放出大量动能。所有研究的T1-氰肟酸的厌氧分解的最终产物是金属th海绵。