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In the title compound, K3[Cu(C10H12N2O10P)]·2H2O, the CuII ion, one potassium cation and a P atom are situated on a twofold rotation axis. The CuII ion is coordinated by two N and four O atoms from one bis­{[bis­(carboxyl­atometh­yl)amino]­meth­yl}phosphinate ligand in a distorted octa­hedral coordination geometry. The two crystallographically independent potassium ions exhibit different coordination environments. The potassium ion in a general position is hepta­coordinated by five carboxyl­ate O atoms, one phosphinate O atom and one water mol­ecule [K—O = 2.718 (3)–3.040 (3) Å], and the potassium ion situated on the twofold rotation axis is hexa­coordinated by four carboxyl­ate O atoms and two water mol­ecules [K—O = 2.618 (3)–2.771 (3) Å]. The water mol­ecules are also involved in formation of inter­molecular O—H...O hydrogen bonds.

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In the cation of the title salt, [Ag(C12H6N2O2)2](C7H3N2O7), the AgI atom is coordinated in a distorted tetra­hedral geometry by four N atoms from two 1,10-phenanthroline-5,6-dione ligands, while the 3,5-dinitro­salicylate anion has only a short contact [2.847 (6) Å] between one of its O atoms and the AgI atom. The dihedral angle between the two 1,10-phenanthroline-5,6-dione ligands is 58.4 (1)°. There is an intra­molecular O—H...O hydrogen bond in the 3,5-dinitro­salicylate anion.

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In the crystal structure of the title compound, C18H13N5·H2O, adjacent mol­ecules are linked by O—H...N and N—H...O hydrogen bonds, generating a chain propagating along [001].

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In the title compound, C16H21N3O3, the piperazine ring adopts a chair conformation, with its N—C bonds in pseudo-equatorial orientations. In the crystal, mol­ecules are linked by O—H...N hydrogen bonds, generating C(5) chains propagating in [101]. Weak aromatic π–π stacking inter­actions also occur [centroid–centroid separation = 3.899 (1) Å].
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