Synthesis and crystal structures of supramolecular adducts of molybdenum and tungsten selenide aqua complexes with macrocyclic cavitand cucurbituril

摘要

The supramolecular compounds {[W_3Se_4Cl_3(H_2O)_6]_2[PyH_is contained inC_(36)H_(36)N_(24)O_(12)]}Cl_3·18H_2O (1) and {[Cl_3SnMo_3Se_4Cl_3(H_2O)_6][Cl_3SnMo_3Se_4Cl_2(H_2O)_7](C_(36)H_(36)N_(24)O_(12)}Cl·26H_2O (2) were isolated from solutions of the selenium-containing tungsten and molybdenum clusters [W_3Se_4(H_2O)_9]~(4+) and [Cl_3SnMo_3Se_4(H_2O)_9]~(3+), respectively, and organic cavitand cucurbituril. X-ray diffraction analysis demonstrated that the macrocyclic cucurbituril molecule is coordinated on both sides by the cluster cations through the formation of complementary hydrogen bonds. Compound 1 has a chain structure stabilized by Se...Se interactions between the adjacent cluster cores. In compound 2, the bridging mu_2-selenium atoms of the cluster fragment Mo_3Se_4 are coordinated to the tin atom of the SnCl_3~- ligand, thus losing the ability to be involved in Se...Se interactions.