Fig. 1: Secondary Building Units (SBUs). | Nature Communications

Fig. 1: Secondary Building Units (SBUs).

From: An all-inorganic three-dimensional polyoxoniobate framework with ppb-level chemiresistive sensing for ammonia

Fig. 1: Secondary Building Units (SBUs).

a Polyhedron representation of Cu4@Nb29 and the view of Cu4@Nb29 with a symmetry plane. b View of the structure of heart-shaped {P2Nb29O93} PONb shell. c Polyhedron representation of {Cu4O16} core. d Polyhedron representations of tri-lacunary Keggin-type {A-α-PNb9O34} unit and basket-shaped {Nb11O43} unit. e Ball and stick representation of {Cu4O16} core.

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