TY - JOUR
T1 - Organic Ionic Crystals
T2 - Solid-Phase Structure and Thermal Properties of Dicationic α,ω-Bis[N,N′-(4-alkylpyridinium)]alkane Hexafluorophosphate Salts
AU - Chae, Hyunho
AU - Lee, A. Reum
AU - Yoon, Minyoung
AU - Choi, U. Hyeok
AU - Park, Gyungse
AU - Lee, Minjae
N1 - Publisher Copyright:
© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2019/9/1
Y1 - 2019/9/1
N2 - As organic ionic crystals, C2-, C3-, and C4-alkylene α,ω-bis[N,N′-(4-alkylpyridinium)] PF6 − salts are synthesized to investigate their thermal properties and phase behaviors along with chemical structure changes. The X-ray crystal structure of 1,2-bis[N,N′-(4-methylpyridinium)]ethane 2PF6 − (2–1) showed that two pyridinium rings in one cation molecule and two pyridinium ring planes of neighboring molecules were exactly parallel. Multiple C−H⋅⋅⋅F hydrogen bonds were observed for all protons of the bis-pyridinium with PF6 − anions. Interestingly, most of the prepared C2-bridged dicationic bis-pyridinium PF6 − salts showed solid–solid phase transitions, which are typical features of soft crystalline materials, such as plastic and liquid crystals. Colorfully aligned crystalline textures of the polarized optical microscope images are formed with strong birefringence for the soft crystalline phase of 1,2-bis[N,N′-(4-n-propylpyridinium)]ethane PF6 −, showing a low entropy of fusion (ΔSf=25.0 J mol−1 K−1). The C2-bridged n-undecyl (2–11) and n-dodecyl (2–12) salts exhibit a very soft solid phase, showing large heat absorptions and entropy changes during their multiple solid-solid phase transitions. Additionally, the C3- and C4-bridged dicationic (bis)pyridinium PF6 − salts are prepared to determine the property changes with different bridge lengths. The longer alkylene connected salts are thermally more stable than the C2-bridged compounds and show only one melting phase transition.
AB - As organic ionic crystals, C2-, C3-, and C4-alkylene α,ω-bis[N,N′-(4-alkylpyridinium)] PF6 − salts are synthesized to investigate their thermal properties and phase behaviors along with chemical structure changes. The X-ray crystal structure of 1,2-bis[N,N′-(4-methylpyridinium)]ethane 2PF6 − (2–1) showed that two pyridinium rings in one cation molecule and two pyridinium ring planes of neighboring molecules were exactly parallel. Multiple C−H⋅⋅⋅F hydrogen bonds were observed for all protons of the bis-pyridinium with PF6 − anions. Interestingly, most of the prepared C2-bridged dicationic bis-pyridinium PF6 − salts showed solid–solid phase transitions, which are typical features of soft crystalline materials, such as plastic and liquid crystals. Colorfully aligned crystalline textures of the polarized optical microscope images are formed with strong birefringence for the soft crystalline phase of 1,2-bis[N,N′-(4-n-propylpyridinium)]ethane PF6 −, showing a low entropy of fusion (ΔSf=25.0 J mol−1 K−1). The C2-bridged n-undecyl (2–11) and n-dodecyl (2–12) salts exhibit a very soft solid phase, showing large heat absorptions and entropy changes during their multiple solid-solid phase transitions. Additionally, the C3- and C4-bridged dicationic (bis)pyridinium PF6 − salts are prepared to determine the property changes with different bridge lengths. The longer alkylene connected salts are thermally more stable than the C2-bridged compounds and show only one melting phase transition.
KW - dicationic pyridinium ions
KW - liquid crystals
KW - phase transitions
KW - thermal stability
KW - X-ray structure
UR - http://www.scopus.com/inward/record.url?scp=85071256076&partnerID=8YFLogxK
U2 - 10.1002/ajoc.201900341
DO - 10.1002/ajoc.201900341
M3 - Article
AN - SCOPUS:85071256076
SN - 2193-5807
VL - 8
SP - 1718
EP - 1725
JO - Asian Journal of Organic Chemistry
JF - Asian Journal of Organic Chemistry
IS - 9
ER -