Strain engineering of multiferroic thin films

Conformational equilibria of N,N-dimethylsuccinamic acid and its lithium salt as a function of solvent

The conformational preferences of N,N-dimethylsuccinamic acid and its Li(+) salt were estimated by comparing the respective experimental NMR vicinal proton-proton coupling constants to semiempirical coupling constants for each staggered conformer as derived by the Haasnoot-De Leeuw-Altona method. The strong gauche preferences for the Li(+) salts clearly depended more on the solvents' hydrogen-bond donating strength (α) than on their hydrogen-bond accepting (β) counterpart, where α and β are the corresponding Kamlet-Taft parameters.

Compounds of glycine with halogen or metal halogenides: review and comparison

The large family of glycine halogenides and metal halogenides encompasses a high variety of different crystal structures. The role of the glycine molecule as a structural unit as a mono-, bi- or tridentate ligand, of the halogenide ions as well as the composition and condensation of the cationic polyhedra is discussed. With respect to the connectivity of the building units, five different structure families of glycine halogenides and glycine-metal halogenides can be distinguished. Parameters such as symmetry, ionic radii, electronegativity of cation and anion and their difference, charge, coordination number, hydration states, stoichiometric ratios and connectivity were weighed against each other in order to see if any correlations exist. The data suggest that cations with high electronegativities seem to promote formation of structures with a low grade of connectivity, i.e., isolated units, and vice versa.

New compounds of glycine with metal halogenides

The crystal structures of five new glycine (H2N–CH2–COOH) metal halogenide compounds were determined by single crystal X-ray diffraction. Three of them are monoclinic phases, GlycineCaCl2 · 3 H2O (space group P21/c, a = 9.964(2), b = 6.868(1), c = 13.959(3) Å, β = 104.11(3)°, R1 = 0.024), GlycineZnCl2 · H2O (space group P21/a, a = 7.868(1), b = 9.124(1), c = 10.645(1) Å, β = 103.51(1)°, R1 = 0.026) and Glycine2ZnCl2 · 2 H2O (space group C2/c, a = 14.444(1), b = 6.916(1), c = 12.968(1) Å, β = 117.90(3)° R1 = 0.033), two of them are orthorhombic phases Glycine3CeCl3 · 3 H2O (space group P212121, a = 4.788(1), b = 12.074(2), c = 30.949(6) Å R1 = 0.034) and Glycine2CaI2 · 3 H2O (space group Pca21, a = 13.059(3), b = 9.862(2), c = 22.724(5) Å R1 = 0.023). The atomic arrangements as well as aspects of the crystal chemistry of these compounds are presented.