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

Self Cite

In the title compound, [Li2(C6H3N2O4)2(NO3)]n, the two symmetry-independent LiI ions are each in a trigonal–bipyramidal coordination and are bridged by N,O-bonding ligands, forming molecular ribbons propagating in [010]. Each LiI ion is also coordinated by two O atoms from nitrate ions, connecting the ribbons into a three-dimensional network. Very strong intramolecular O—H⋯O hydrogen bonds occur between the carboxyl and the carboxylate group.

Section: S1 Commentmentioning

confidence: 99%

Poly[(μ₄-3-carboxypyrazine-2-carboxylato)(μ₄-nitrato)dilithium]

Starosta¹,

Leciejewicz²

2012

Self Cite

“…In all of them, Li coordination is trigonal bipyramidal (Tombul et al, 2008), (Tombul & Güven, 2009), (Starosta & Leciejewicz, 2011), (Starosta & Leciejewicz, 2013).…”

Section: Methodsmentioning

confidence: 99%

“…For the structures of lithium complexes with pyrazine-2,3-dicarboxylate ligands, see : Tombul et al (2008); Tombul & Gü ven (2009) ;Starosta & Leciejewicz (2011. The structure of 5,6-dimethylpyrazine-2,3-dicarboxylic acid dihydrate was reported by Vishwershwar et al (2001).…”

Section: Related Literaturementioning

confidence: 99%

catena-Poly[[aqualithium(I)]-μ-3-carboxy-5,6-dimethylpyrazine-2-carboxylato-κ⁴O²,N¹:O³,N⁴]

Starosta

Leciejewicz

2013

Self Cite

Key indicators: single-crystal X-ray study; T = 293 K; mean (C-C) = 0.002 Å; R factor = 0.040; wR factor = 0.110; data-to-parameter ratio = 11.9.The asymmetric unit of the title compound, [Li(C 8 H 6 N 2 O 4 )-(H 2 O)] n , comprises three Li cations, two of which are located on a twofold rotation axis, two carboxylate anions and three water molecules, of which two are situated on the twofold rotation axis being aqua ligands. Both carboxylate anions are in 2 -bridging mode. All Li ions show a trigonal-bipyramidal coordination mode; the two located in special positions are bridged through N,O-bonding sites generating a polymeric ribbon along the c-axis direction. The Li cation in a general position creates an independent polymeric ribbon through N,O-bonding sites of the two symmetry-related ligands; the trigonal-bipyramidal coordination is completed by an aqua ligand. In both carboxylate anions, a carboxylate and a carboxylic acid group form an intramolecular hydrogen bond. The polymeric ribbons running along [001] are interconnected by hydrogen bonds in which the water molecules act as donors and carboxylate O atoms act as acceptors, giving rise to a three-dimensional architecture. independent and constrained refinement Á max = 0.18 e Å À3 Related literature

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

Starosta

Leciejewicz

2011

Self Cite

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.