Fig. 2: Characterizations and thermal property of the V2D-BBL structure.
From: Vertical two-dimensional layered fused aromatic ladder structure
a Fourier-transform infrared (FT-IR) spectra (KBr pellets) of THA (orange line), NDA (green line), intermediate PIN (wine line) and V2D-BBL structure (black line). Spectra were magnified in the range of 1350–1850 cm−1, highlighting the formation of benzimidazole rings (Full spectra and corresponding assignments are shown in Supplementary Fig. 2. b, Solid-state 13C CP-MAS NMR spectra: Top-right inset: the structure of an intermediate PIN sample. Top-left inset: a photograph of a powder PIN sample. Bottom-right inset: the structure of the V2D-BBL sample. Bottom-left inset: a photograph of the V2D-BBL sample. c XPS survey of the V2D-BBL sample. Inset: deconvoluted N 1 s spectrum. d Thermogravimetric analysis (TGA) curves of the V2D-BBL sample under air (black) and N2 (navy) atmospheres at a ramping rate of 10 °C m−1.
