Biomedical subjects
Publications and source records attributed to M Subha Nandhini.
The glycine molecule in the title compound, Na(NO(3)).C(2)H(5)NO(2), exists in the zwitterionic form. The Na atom exhibits eightfold coordination and the polyhedron may be visualized as a distorted hexagonal bipyramid. The glycine molecules are linked through head-to-tail hydrogen bonds and are found 'sandwiched' between the Na(NO(3)) layers.
A determination of the structure of the title compound, C3H7NO2, leads to an accurate description of its molecular dimensions and crystal packing. As in the structure of the L-isomer, the molecules aggregate into alternating layers, each consisting of only one type of isomer. The molecules in each layer are interconnected through head-to-tail sequences generated by a cell translation and a 2(1) screw axis. Adjacent layers are interconnected by head-to-tail sequences generated by a glide plane.
In the title compound, C2H6NO2+.C2HO4-, the glycine molecule exists in the cationic form and the oxalic acid molecule in the mono-ionized state. The molecules aggregate into alternate columns of glycinium and semi-oxalate ions. The structure is stabilized by an extensive network of hydrogen bonds.
In the title salt, C(5)H(10)NO(2)(+).C(4)H(5)O(6)(-), proline exists as a cation and the tartaric acid as a semi-tartrate anion. The semi-tartrate ions form hydrogen-bonded strings along the c axis. These strings are interconnected through the proline molecules, forming a layered network parallel to the bc plane. The proline molecules, however, do not directly interact among themselves, except for a weak C-H.O hydrogen bond.