Fig. 3: Infrared spectra of (CH3–(CH2)9–NH3)2MnCl4 at variable temperatures from 288 K to 338 K collected while heating. | NPG Asia Materials

Fig. 3: Infrared spectra of (CH3–(CH2)9–NH3)2MnCl4 at variable temperatures from 288 K to 338 K collected while heating.

From: Reversible colossal barocaloric effect dominated by disordering of organic chains in (CH3–(CH2)n−1–NH3)2MnCl4 single crystals

Fig. 3

a Structure of the unilateral organic chain and the conterminous part of the inorganic framework part. b Infrared spectra in the region of 1400–2000 cm−1 involving CH2 scissoring and NH3 bending vibrations and the C–NH3+ band, and (c) the corresponding band frequencies vs. temperature. d Infrared spectra in the region of 1000–1400 cm−1 containing the CH2 wagging and CH3 symmetric deforming vibrations, and (e) the corresponding CH2 wagging band frequencies vs. temperature. f Infrared spectra in the region of 2000–3300 cm−1, showing the bands of the C–H stretching vibration (2800–3000 cm−1) and NH3 stretching vibrations (purple zone). g Infrared spectra concerning C–H stretching vibrations of CH2 and CH3 with a magnified view of the corresponding area shown in (f).

Back to article page