Synthesis and molecular and crystal structure of the coordination metallopolymer of scandium(III) nitrate with 4,4,10,10-tetramethyl-1,3,7,9,-tetraazospiro[5.5]undecane-2,8-dione

Structural properties of scandium inorganic salts

“…The Sc metal center is forced into a CN-7 (Figure 15), which was described as pentagonal bipyramidal due to the remarkable planarity of the ligand (deviation of 0.023 Å for 20 atoms).The remaining outersphere Sc-NO3 complexes are polymeric. These include a 4,4'bipyridine-N,N'-dioxide[79] ligand (seeFigure 16), 2,5-dihydroxyterephthalato,[80] and a tetramethyl, tetraazaspiro, undecane, dione[81] complex, each with an outersphere NO3.The last two salts have bound water molecules that complete the OC-6 coordination sphere of each Sc metal center. <<Insert Figure 16 here>> 2.2.4.…”