Synthesis, structural characterization and bonding properties of heterometallic-heterobridging cubane-type tetranuclear cluster compounds [CuMo3OS3]·I·(μ-OAc)[S2P(OC2H5)2]3·L (L=py, DMF)
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Abstract
By the reaction of cluster [Mo3OS3](dtp)4(H2O) used as starting material with CuI using [3+1] mode, two novel heterometallic-heterobridging cubane-type tetranuclear cluster compounds [CuMo3OS3]·I·(μ-OAc)[S2P(OC2H5)2]3·L [(I)L=py, (II)L=DMF] [dtp=S2P(OC2H5)2; OAc=OOCCH3] containing [CuMo3OS3] core have been obtained. Compounds (I) and (II) have been characterized by IR, EPR, UV-VIS, electrochemistry and X-ray crystallography. By comparison of these two compounds with the analogous [CuMo3S4] series in the structure and molecular orbital calculation, the influence of mixed S/O bridging on the structure is discussed. It is demonstrated that the {Mo3S3} cluster ring in [Mo3OS3]4+ possesses a similar quasi-aromaticity to [Mo3S4]4+. Crystal data: for (I), space group=\(P\overline 1 \),a=13.781(8)Å,b=14.523(6)Å,c=12.098(6)Å, α=98.37(4)°, β=109.41(5)°, γ=105.00(5)°,V=2133(2)Å3,Z=2,R=0.058; for (II), space group=\(P\overline 1 \),a=13.215(4)Å,b=17.818(8)Å,c=9.873(4)Å, α=106.06(4)°, β=109.78(3)°, γ=82.00(3)°,V=2100(2)Å3,Z=2,R=0.045.
Key words
Heterometallic-heterobridging cubane-type tetranuclear cluster preparation crystal structure molecular orbital calculation quasi-aromaticity copper molybdenumPreview
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