Poly[aqua­(μ3-pyridazine-4-carboxyl­ato-κ2 O:O:O′)lithium]

The structure of the title compound, [Li(C5H3N2O2)(H2O)]n, is composed of centrosymmetric dimers in which two LiI ions are bridged by a carboxyl­ate O atom, each donated by a ligand, acting in a bidentate mode. The second carboxyl­ato O atoms bridge the dimers to LiI ions in adjacent dimers, forming mol­ecular layers parallel to (001). Each LiI ion is coordinated by two bridging carboxyl­ate O atoms, a bridging carboxyl­ate O atom donated by the adjacent dimer and an aqua O atom, resulting in a distorted tetra­hedral coordination geometry. The layers are held together by O—H⋯N hydrogen bonds in which coordinated water O atoms act as donors and ligand hetero-ring N atoms as acceptors

Poly[hydrazin-1-ium [diaqua­bis­(μ4-pyridazine-3,6-dicarboxyl­ato)trilithate] monohydrate]

The structure of the title compound, {(N2H5)[Li3(C6H2N2O4)2(H2O)2]·H2O}n, is composed of mol­ecular dimers, each built up of two symmetry-related LiI ions with distorted trigonal–bipyramidal coordinations bridged by two deprotonated ligand mol­ecules via their N,O-bonding sites. Doubly solvated LiI ions with a distorted tetra­hedral geometry link adjacent dimers, forming a polymer generated by bridging bidentate carboxyl­ato O atoms to LiI ions in adjacent dimers, forming anionic layers parallel to the ac plane with monoprotonated hydrazinium cations and crystal water mol­ecules positioned between them. The layers are held together by an extended system of hydrogen bonds in which the hydrazinium cations and coordinated and crystal water mol­ecules act as donors and carboxyl­ate O atoms act as acceptors

Poly[di-μ2-aqua-μ2-(5-methyl­pyrazine-2-carboxyl­ato)-(5-methyl­pyrazine-2-carboxyl­ato)-μ3-nitrato-trilithium]

The asymmetric unit of the title compound, [Li3(C6H5N2O2)2(NO3)(H2O)2]n contains three LiI ions, two ligand anions, two water mol­ecules and a nitrate anion. Related by a centre of inversion, they form a centrosymmetric mol­ecular cluster in which one of the LiI ions shows trigonal–bipyramidal and the other two distorted tetra­hedral coordination. LiI ions are bridged by water O atoms and carboxyl­ate O atoms donated by one of the ligands. The clusters, bridged by two nitrato O atoms, form mol­ecular columns along [010], which are held together by O—H⋯O and O—H⋯N hydrogen bonds and π–π inter­actions [centroid–centroid distances = 3.694 (1) and 3.796 (1) Å]

Bis(μ-pyridazine-3-carboxyl­ato-κ2 O:O′)bis­[aqua­dioxido(pyridazine-3-carboxyl­ato-κ2 N 2,O)uranium(VI)] dihydrate

The structure of the binuclear title complex, [U2(C5H3N2O2)4O4(H2O)2]·2H2O, is composed of centrosymmetric dimers in which each UO2 2+ ion is coordinated by two ligand mol­ecules. One donates its N,O-bonding group and the other donates both carboxyl­ate O atoms. Each of the latter bridges adjacent uranyl ions. The coordination environment of the metal center is a distorted penta­gonal bipyramid. The dimers are inter­connected by O—H⋯O hydrogen bonds between coordinated and uncoordinated water mol­ecules and carboxyl­ate O atoms. An intra­molecular O—H⋯N inter­action is also present

catena-Poly[[(6-carb­oxy­pyrazine-2-carboxyl­ato)lithium]-μ-aqua]

The asymmetric unit of the title compound, [Li(C6H3N2O4)(H2O)]n, contains an LiI ion with a distorted trigonal–bipyramidal coordination environment. It is chelated by a singly protonated ligand mol­ecule via its heterocyclic N atom, by two O aoms, each donated by an adjacent carboxyl­ate group, and is further coordinated by a water O atom which acts as a bridge, forming a mol­ecular ribbon. A proton attached to one of the carboxyl­ate O atoms is situated on an inversion centre and forms a short centrosymmetric hydrogen bond, generating mol­ecular layers parallel to the ac plane. These layers are held together by weak O—H⋯O hydrogen bonds in which the coordinated water mol­ecules act as donors, whereas carboxyl­ate O atoms are acceptors

catena-Poly[[μ2-aqua-diaqua­bis­(μ4-pyridazine-3,6-dicarboxyl­ato)tetra­lithium] monohydrate]

In the polymeric structure of the title compound {[Li2(C6H2N2O4)2Li(H2O)2Li(H2O)]·H2O}n, the coordination of two independent LiI ions is distorted trigonal–bipyramidal and that of the other two independent LiI ions is distorted tetra­hedral. The former two LiI ions are bridged by hetero-ring N atoms of two independent pyridazine-3,6-dicarboxyl­ate ligands, making a dimeric moiety. The carboxyl­ato-O atoms of both bidentate ligands bridge the dimers to adjacent independent aqua-coordinated LiI ions, forming mol­ecular ribbons. The latter are bridged by ligand carboxyl­ato and aqua O atoms, forming mol­ecular layers parallel to (100) which are held together by an extended system of O—H⋯O hydrogen bonds

catena-Poly[[(aqualithium)-μ-3-carboxypyrazine-2-carboxylato-κ4 O 2,N 1:O 3,N 4] monohydrate]

The polymeric structure of the title compound {[Li(C6H3N2O4)(H2O)]·H2O}n, contains two symmetry-independent LiI complex units, both having distorted trigonal–bipyramidal coordination environments. The LiI ions are bridged by both the N and O atoms of the ligands, generating two symmetry-independent polymeric chains propagating along the b-axis direction. In both ligands, the second carboxyl­ato O atom remains protonated, serving as a donor in a short intra­molecular O—H⋯O hydrogen bond. The coordination of each LiI ion is completed by a water O atom. The ribbons are held together by a network of O—H⋯O hydrogen bonds in which the coordinated and uncoordinated water mol­ecules are donors and the carboxyl­ato O atoms act as acceptors

Di-μ-aqua-bis­(μ-pyridazine-4-carboxyl­ato-κ2 N:N′)bis­[triaqua­(pyridazine-4-carboxyl­ato-κ2 O,O′)lead(II)] dihydrate

The structure of the title compound, [Pb2(C5H3N2O2)4(H2O)6]·2H2O, is composed of dimeric mol­ecules in which two symmetry-related Pb2+ ions are bridged by a pair of two pyridazine-4-carboxyl­ate ligand mol­ecules via both heterocyclic N atoms and two water O atoms. Each Pb2+ ion is also coordinated by two carboxyl­ate O atoms and three water O atoms, leading to a highly irregular coordination polyhedron around Pb2+. The dimers are inter­connected by hydrogen bonds between coordinated and uncoordinated water mol­ecules and the carboxyl­ate O atoms. O—H⋯N inter­actions are also present

Hydrazinediium bis­(6-carboxy­pyridazine-3-carboxyl­ate) dihydrate

The triclinic unit cell of the title compound, N2H6 2+·2C6H3N2O4 −·2H2O, contains one doubly protonated hydrazine cation which lies on an inversion centre, two symmetry-related singly deprotonated 6-carboxy­pyridazine-3-carboxyl­ate anions and two symmetry-related solvent water mol­ecules. The anions inter­act via hydrogen bonds to form double ribbons which are bridged by hydrogen bonds donated by hydrazinediium cations and water molecules

Bis[[(6-carb­oxy­pyridazine-3-carboxyl­ato-κ2 N 2,O 3)lithium]-μ-penta­hydrogen­dioxy­gen(1+)]

The structure of the title compound, [Li(C6H3N2O4)2(H5O2)], is composed of centrosymmetric monomers in which an LiI ion is chelated by two N,O-bonding groups donated by two ligands. The LiI ion and both ligand mol­ecules are coplanar [r.m.s. deviation 0.0047 (2) Å] and water O atoms are in the axial positions. The second carboxyl group of each ligand remains protonated. An additional H atom, located between adjacent coordinated water mol­ecules and observed on Fourier maps, maintains the charge balance within the monomers and bridges them by short symmetric hydrogen bonds of 2.518 (3) Å to form catenated ribbons. The monomers also inter­act via hydrogen bonds in which water and carboxyl O atoms act as donors