  Crystal phase is well studied and presents a periodical atom arrangement in
three dimensions lattice, but the "amorphous phase" is poorly understood. Here,
by starting from cage-like bicyclocalix[2]arene[2]triazines building block, a
brand-new 2D MOF is constructed with extremely weak interlaminar interaction
existing between two adjacent 2D-crystal layer. Inter-layer slip happens under
external disturbance and leads to the loss of periodicity at one dimension in
the crystal lattice, resulting in an interim phase between the crystal and
amorphous phase - the chaos phase, non-periodical in microscopic scale but
orderly in mesoscopic scale. This chaos phase 2D MOF is a disordered
self-assembly of black-phosphorus like 3D-layer, which has excellent
mechanical-strength and a thickness of 1.15 nm. The bulky 2D-MOF material is
readily to be exfoliated into monolayer nanosheets in gram-scale with
unprecedented evenness and homogeneity, as well as previously unattained
lateral size (>10 um), which present the first mass-producible monolayer 2D
material and can form wafer-scale film on substrate.
