Coordination compounds of strontium: Syntheses characterizations, and crystal structures of [Sr(mu-ONc)(2)(HONc)(4)](2) and Sr-5(mu(4)-O)(mu(3)-ONep)(4)(mu-ONep)(4)(HONep)(solv)(4)(ONc = O2CCH2CMe3; Nep = Ch(2)CMe(3); solv =tetrahydrofuran or 1-methyl-imidazole)

We have synthesized and characterized two novel Sr compounds: [Sr(mu-ONc)(2 )(HONc)(4)](2) (1, ONc=O2CCH2CMe3), and Sr-5(mu(4)-O)(mu(3)-ONep)(4)(mu-ONe p)(4)(HONep)(solv)(4) [ONep=OCH2CMe3, solv=tetrahydrofuran (THF), 2a; 1-met hyl-imidazole (MeIm), 2b], that demonstrate increased solubility in compari son to the commercially available Sr precursors. The two metal centers of 1 share four unidentate bridging mu-ONc ligands and complete their octahedra l geometry through coordination of four monodentate terminal HONc ligands. The structural arrangement of the central core of 2a and 2b are identical, wherein four octahedral Sr atoms are arranged in a square geometry around a mu(4)-O ligand. An additional seven-coordinated Sr atom sits directly atop the mu(4)-O to form a square-pyramidal arrangement of the Sr atoms, but th e apical Sr-O distance is too long to be considered a bond. In solution, co mpound 1 is disrupted forming a monomer but 2a and 2b retain their structur es.