Crystalline and solution phase of N,N-dimethylethylenediamine complexed with lithium triflate and sodium triflate: Intramolecular and intermolecular hydrogen bonding

Article Abstract:

Infrared and Raman spectroscopy are used to study hydrogen-bonding interactions and the cation coordination effect in solutions of N,N-dimethylethylenediamine (DMEDA) complexed with lithium triflate (LiTf) and sodium triflate (NaTf). The addition of LiTf and NaTf to DMEDA shifts the N-H stretching frequencies through two competing effects where the cation coordination effect lowers the frequencies, while the disruption of the hydrogen-bonding interactions increase the frequencies.

X-rays, X-ray diffraction

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Hydrogen bonding and the inductive effect in crystalline and solution phases of hexylamine:LiCF3SO3 and dipropylamine:LiCF3SO3: Application to branched poly(ethylenimine)

Article Abstract:

The nature of hydrogen bonding and the cation inductive effect in solutions of LiCF3SO3 (LiTf) dissolved in hexylamine, a primary amine, and dipropylamine, a secondary amine, are studied using Raman and infrared (IR) spectroscopy. The cation-polymer and hydrogen bonding interactions of branched poly(ethylenimine) (BPEI) complexed with LiTf are modeled by the solutions of hexylamine and dipropylamine containing dissolved LiTf.

Oklahoma, Crystals, Crystal structure, Properties

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Down to the quantum limit at the neutral-to- ionic phase transition of (BEDT-TTF)-(CIMe-TCNQ): Symmetry analysis and phase diagram

Article Abstract:

The neutral-to-ionic (N-1) phase transition in the one dimensional organic complex (BEDT-TTF)-(CIMeTCNQ) and the phase diagram of the N-1 transition down to the quantum limit is presented. The symmetry breaking associated with the transition and the evolution of its first order character under pressure is discussed.

Observations, Neutrons, Neutron diffraction, Charge transfer, Chemical properties, X-ray analysis

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