Biomedical subjects

G J Perpétuo

Publications and source records attributed to G J Perpétuo.

4 recordsLinked to original sources

PubMed2001

Bis(melaminium) sulfate dihydrate.

The crystals of a new melaminium salt, bis(2,4,6-triamino-1,3,5-triazin-1-ium) sulfate dihydrate, 2C3H7N6+*SO4(2-)*2H2O, are built up from monoprotonated melaminium(1+) residues, sulfate(2-) anions and water molecules. The SO4(2-) ion has a slightly distorted tetrahedral geometry. The melaminium residues are interconnected by N-H.N hydrogen bonds, forming chains. The chains of melaminium residues develop a three-dimensional network through multiple donor-acceptor hydrogen-bond interactions with sulfate anions and water molecules.

Journal Article↗

PubMed2001

Melaminium chloride hemihydrate.

The crystals of a new melaminium salt, 2,4,6-triamino-1,3,5-triazin-1-ium chloride hemihydrate, C(3)H(7)N(6)(+).Cl(-).0.5H(2)O, are built up from single-protonated melaminium residues, chloride anions and water molecules. The protonated melaminium cations lie on a twofold axis, while the chloride anions and water molecule lie on the m plane. The melaminium residues are interconnected by N-H...N hydrogen bonds, forming chains parallel to the (001) plane. The chains of melaminium residues form a three-dimensional network through hydrogen-bond interactions with chloride anions and water molecules.

Journal Article↗

PubMed2001

Melaminium bis(4-hydroxybenzenesulfonate) dihydrate.

The crystals of a new melaminium salt, 2,4,6-triamino-1,3,5-triazine-1,3-diium bis(4-hydroxybenzenesulfonate) dihydrate, C3H8N6(2+)*2C6H5O4S-*2H2O, are built up from doubly protonated melaminium(2+) residues, dissociated p-phenolsulfonate anions and water molecules. The doubly protonated melaminium dication lies on a twofold axis. The hydroxyl group of the p-hydroxybenzenesulfonate residue is roughly coplanar with the phenyl ring [dihedral angle 13 (2) degrees ]. A combination of ionic and donor-acceptor hydrogen-bond interactions link the melaminium and p-hydroxybenzenesulfonate residues and the water molecules to form a three-dimensional network.

Journal Article↗

PubMed2001

Melaminium phthalate.

The crystals of the new melaminium salt, 2,4,6-triamino-1,3,5-triazin-1-ium hydrogenphthalate, C3H7N6+.C8H5O4-, are built up from single protonated melaminium residues and single dissociated hydrogenphthalate(1-) anions. The protonated melaminium ring is almost planar. The best plane through the non-dissociated carboxyl group (COOH) of the hydrogenphthalate(1-) anion is inclined at an angle of 16.4 (2) degrees to the plane of the six-membered hydrogenphthalate ring, while the plane of the ionized COO- group is roughly perpendicular [84.2 (2) degrees ] to this plane. A combination of ionic and donor-acceptor hydrogen-bond interactions linking together the melaminium and hydrogenphthalate residues forms a three-dimensional network.

Journal Article↗