Zinc and lithium hydrogen-β-glutamate: Large-pore network layer structures

Frank Wiesbrock, Hubert Schmidbaur

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

The symmetrical anion [β-GluH]- of β-glutamic acid [β-GluH2] has been introduced into crystal engineering of metal complexes for the first time. Neutralization of aqueous solutions of β-glutamic acid with zinc oxide or lithium hydroxide affords crystalline samples of zinc bis(hydrogen-β-glutamate) trihydrate and lithium hydrogen-β-glutamate hydrate, respectively. [Zn(β-GluH)2(H2O)3] has a layer structure with corrugated sheets featuring a square-grid pattern of the tetra-coordinated zinc dications and bridging [O2C-CH2CH(NH3)CH2-CO 2]- anions (in their gauche- conformation). The uniform meshes of the network are based on puckered 32-membered rings. Neighbouring undulated layers are mutually shifted into a space-filling indentation which also generates a network of hydrogen bonds involving the ammonio and carboxylate groups and the intercalated water molecules. [Li(β-GluH)(H2O)] has a less corrugated layer structure based on a parallelogram-grid of lithium cations which are connected by three bridging [β-GluH]- anions (in their anti-conformation). The water molecule is part of the tetrahedral coordination sphere of the metal atom. The layers represent a mixed-mesh network with pores based on 8- and 32-membered rings. Neighbouring layers are mutually shifted to allow for extensive hydrogen bonding.

Original languageEnglish
Pages (from-to)3201-3205
Number of pages5
JournalJournal of the Chemical Society. Dalton Transactions
Issue number16
DOIs
StatePublished - 2002
Externally publishedYes

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