[WS4Cu3I2](-) and [WS4Cu4](2+) secondary building units formed a metal-organic framework: Large tubes in a highly interpenetrated system

A 3D metal-organic framework, {[WS4Cu4(dpbp)(4)](2+)center dot[WS4Cu3(dpbp)(2)I-2](-)center dot I-}(n)center dot xSolvent, [dpbp = 4,4'-di(4-pyridyl)-biphenyl] with an unprecedent 8-fold non-equivalent interpenetration mode is presented, which contains four anionic and four cationic frameworks formed by tetranuclear [WS4Cu3I2](-) and pentanuclear [WS4Cu4](2+) SBUs with long dpbp ligands. Large rhombus-shaped tubes with diagonal dimensions of similar to 20 x 10 angstrom are formed in spite of high interpenetration.