Step by step: The sequential coordination of calcium ions (yellow) to four lipid carbonyl oxygen atoms in neutral zwitterionic phospholipid bilayers has been studied by molecular dynamics simulations.

A highly isotactic stereoblock PLA has been obtained using the achiral heteroscorpionate zwitterionic zinc complexes as catalysts, for the first time, via a chain-end control mechanism.

The zwitterionic cyclopentadienyl-bis(2-oxazolinyl)borate diamidozirconium(IV) complex is a precatalyst for the cyclization of aminoalkenes to five- and six-membered rings under mild conditions.

First demonstration of heat and pH-responsive hydrogel of SDS and a zwitterionic amphiphile, sodium N-(n-dodecyl-2-aminoethanoyl)-L-valinate with very low minimum gelation concentration.

A molecular thermodynamic theory is developed for polyampholytes from the coarse-grained charged hard-sphere chain model. The phase behavior of polyampholytes with variations in sequence and chain length is satisfactorily predicted by the theory, consistent with simulation results and experimental observations. At a fixed chain length, the phase envelope expands as the sequence of charge distri...

A polymethacrylate-based capillary monolithic column with zwitterionic functional groups was prepared by an in situ copolymerization method. The column was used in pressurized capillary electrochromatography (pCEC) for the separation of a test mixture of basic, neutral and acidic analytes. Unique manipulation of selectivity in pCEC was demonstrated by fine-tuning the applied voltage. The separa...

ZIC®-HILIC Columns The ZIC®-HILIC columns have a sulfobetaine type zwitterionic stationary phase covalently attached to 200 Å pore size and 5 μm particle size silica (see Figure 1). The permanently charged, yet overall neutral, highly polar zwitterionic column provides a unique environment particularly capable of solvating polar and charged compounds, which enables high-performance HILIC separa...

A hybrid quantum mechanical molecular mechanical ~QMMM! approach is used to study H3O , H2O, NH4 1 , NH3 , Cl , HCl, F, HF, CH3COO , CH3COOH, Ag 1 and glycine in both zwitterionic and nonzwitterionic forms in water. The free energies of hydration of these species are presented and are shown to compare favorably with experimental values. The difference in water– glycine interaction energy betwee...

Three isostructural Mn(II) compounds with a zwitterionic dicarboxylate ligand and different pseudohalides were synthesized, and then structurally and magnetically characterized. They are formulated as [Mn(L)(X)(2)(H(2)O)(2)](n) [X = N(3)(-) (1), NCO(-) (2), NCS(-) (3), L = 1,4-bis(4-carboxylato-1-pyridinium)butane]. In these compounds, adjacent Mn(II) ions are connected into coordination chains...