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The syntheses and structures of two new ZnII complexes, a 2D graphite-like layer {[Zn(PIA)H2O] ⋅H2O} n ( 1) and an independent 1D single-walled metal-organic nanotube (SWMONT) {[Zn2(PIA)2(bpy)2] ⋅2.5 H2O ⋅DMA} n ( 2), have been reported based on a 'Y'-shaped 5-(pyridine-4-yl)isophthalic acid ligand (H2PIA). Interestingly, the 2D graphite-like layer in 1 can transform into the independent 1D SWMONT in 2 with addition of 2,2′-bipyridine (bpy), which represents the first successfully experimental example of an independent 1D metal-organic nanotube generated from a 2D layer by a 'rolling-up' mechanism. [ABSTRACT FROM AUTHOR]