[2,6-Bis(2-pyridylamino)pyridine]dinitratocadmium monohydrate

The Cd atom in the title complex, [Cd(NO₃)₂(C₁₅H₁₃N₅)]·H₂O or [Cd(NO₃)₂(tpdaH₂)]·H₂O (tpdaH₂ is tripyridyldiamine), has a penta­gonal-bipyramidal coordination formed by the tridentate tpdaH₂ ligand and two chelate nitrate groups. The tpdaH₂ ligand is mer-coordinated, with the N atom of the central pyridine ring in the equatorial position [Cd-N = 2.3148 (17) Å] and the N atoms of the peripheral pyridine rings in the axial positions [Cd-N = 2.2345 (19) and 2.2351 (19) Å, and N-Cd-N = 169.39 (6)°]. The remaining four equatorial positions are occupied by the four O atoms of two nitrate groups, one of which has almost equal Cd-O bond lengths [2.431 (2) and 2.4644 (19) Å], whereas the other shows a significant difference between the Cd-O bond lengths [2.441 (2) and 2.603 (2) Å]. The H atoms of both NH groups of the tpdaH₂ ligand are involved in hydrogen bonds with water O atoms as acceptors, whereas both water H atoms form hydrogen bonds with the O atoms of one of the nitrate groups. The hydrogen bonds link the mol­ecules of the title complex and solvent mol­ecules into an infinite three-dimensional network.

Bis{μ-N-[bis­(hydroxy­methyl)(oxidomethyl)methyl]glycinato}bis[dimethyl­tin(IV)] dioxane hemisolvate

The title complex, [Sn₂(CH₃)₄(C₆H₁₁NO₅)₂]·0.5C₄H₈O₂, comprises the centrosymmetric cyclic dimeric Sn^IV complex and an uncoordinated, partially occupied, centrosymmetric dioxane mol­ecule. Each Sn^IV atom has a distorted octa­hedral six-coordinate configuration formed by the tridentate tricine ligand, one bridging O atom and two methyl groups. Within the cyclic dimer, the Sn...Sn separation is 3.6574 (4) Å. All H atoms of the NH and OH groups are involved in inter­molecular hydrogen bonds with the O atoms as acceptors. There are also important weak inter­molecular C—H...O hydrogen bonds, which link the mol­ecules of the dimer and dioxane into an infinite three-dimensional network.