Four selenoarsenates with different transition-metal complexes [Co(tren)H]AsSe [tren = tris(2-aminoethyl)amine] (); [Ni(dien)](AsSe) (dien = diethylenetriamine) (); [Zn(tren)](AsSe) () and [Mn(tren)](AsSe) () were solvothermally synthesized in a mixed solvent of organic amine and alcohol solution. The compounds have pyramidal/tetrahedral structures (AsSe/AsSe), and contain transition metal (Co, Ni, Zn and Mn) complex that form distinct zero-dimensional (0-D) clusters. Arsenic atoms form a tetrahedron in compounds and ; consists of discrete tetrahedral (AsSe) and transition metal complex [Co(tren)]; is composed of an anion [AsSe] cluster and transition metal complex [Ni(dien)]. In compounds and , arsenic atom forms a pyramidal AsSe and the two pyramidal AsSe share a corner connection to form a dimer [AsSe]; is characterized as a cluster consisting of two unsaturated [Zn(tren)] caiton linked by a dimer (AsSe) linkage; in , unsaturated [Mn(tren)] caiton is linked to two trigonal-bipyramidal [Mn(tren)]Se via dimer (AsSe) to form [Mn(tren)][AsSe] cluster. To our knowledge, [Zn(tren)](AsSe) () is the first zinc selenoarsenate containing the (AsSe) anion type. Furthermore, the Mn ions adopt a trigonal-biyramidal (five-coordinate) and octahedral (six-coordinate) environment. Adding KCO/CsCO to the synthesis system is necessary and may act as a mineralizer. Several properties of compounds - have been characterized in our studies, in particular their strong photocurrent response characteristics under visible light irradiation.
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| http://dx.doi.org/10.3389/fchem.2022.890496 | DOI Listing |
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