Synthesis, Characterization and Mesomorphic Properties of Unsymmetrical N-[4-(Alkoxy)-2-Hydroxybenzylidene]-N′-(4-Alkoxybenzylidene) Azines and Their Copper (II) Complexes
摘要:
A new series of mesogenic unsymmetrical azines, N-[4-(alkoxy)-2-hydroxybenzylidene]-N'-(4-n-alkoxybenzylidene) azines, ROC6H4CH=N-N=CHC6H3OHOR, where R = CmH2m+1 (m = 6, 8, 10, 12, and 14), and their copper (II) complexes has been synthesized. They were characterized by elemental analyses, Fourier transform infrared (FT-IR), H-1 and C-13 nuclear magnetic resonance (NMR) spectra, ultraviolet (UV)-visible, and magnetic susceptibility measurements. The copper (II) complexes are square planar. The mesomorphic properties of these compounds were investigated by differential scanning calorimetry and polarizing microscopy. The unsymmetrical azines with m = 6, 12, and 14 exhibit monotropic nematic, enantiotropic, and monotropic smectic A phases, whereas azines with m = 8 display enantiotropic nematic and m = 10 display both enantiotropic smectic A and nematic mesophases in the heating and cooling cycles. The copper (II) complexes of the azines are nonmesomorphic in nature with high clearing temperatures and displayed polymorphism (crystal-crystal transitions) in both the heating and cooling cycles.
Synthesis, Characterization and Mesomorphic Properties of Unsymmetrical N-[4-(Alkoxy)-2-Hydroxybenzylidene]-N′-(4-Alkoxybenzylidene) Azines and Their Copper (II) Complexes
摘要:
A new series of mesogenic unsymmetrical azines, N-[4-(alkoxy)-2-hydroxybenzylidene]-N'-(4-n-alkoxybenzylidene) azines, ROC6H4CH=N-N=CHC6H3OHOR, where R = CmH2m+1 (m = 6, 8, 10, 12, and 14), and their copper (II) complexes has been synthesized. They were characterized by elemental analyses, Fourier transform infrared (FT-IR), H-1 and C-13 nuclear magnetic resonance (NMR) spectra, ultraviolet (UV)-visible, and magnetic susceptibility measurements. The copper (II) complexes are square planar. The mesomorphic properties of these compounds were investigated by differential scanning calorimetry and polarizing microscopy. The unsymmetrical azines with m = 6, 12, and 14 exhibit monotropic nematic, enantiotropic, and monotropic smectic A phases, whereas azines with m = 8 display enantiotropic nematic and m = 10 display both enantiotropic smectic A and nematic mesophases in the heating and cooling cycles. The copper (II) complexes of the azines are nonmesomorphic in nature with high clearing temperatures and displayed polymorphism (crystal-crystal transitions) in both the heating and cooling cycles.
Anti-Markovnikov Hydroalkylation of Styrene Derivatives via Hydrazones Catalyzed by Ru-PNP Complex
作者:Siyi Luo、Hanh D. M. Pham、Chen-Chen Li、Zihang Qiu、Ruofei Cheng、Rustam Z. Khaliullin、Chao-Jun Li
DOI:10.1021/acs.orglett.4c00610
日期:2024.4.19
Ru(II)-PNP complex demonstrated high activity in the anti-Markovnikov hydroalkylation of nonpolarized terminal alkenes via hydrazones. Hydrazone served as a carbanion equivalent to combine with the electrophilic alkene substrate upon activation by the ruthenium catalyst, forming a new C–C bond in a concerted pathway with N2 as the only theoretical byproduct. Experimental and computationalstudies suggested