Syntheses, structures, and properties of multidimensional lithium coordination polymers based on aliphatic carboxylic acids

Abstract

Three lithium coordination polymers, [Li4(H2O)2(EDTA)] (1), [Li4(H2O)4(BTCA)] (2), and (H2NMe2)2[Li2(H2O)2(BTCA)] (3) (H4EDTA = ethylenediaminetetraacetic acid, H4BTCA = 1,2,3,4-butane tetracarboxylic acid, H2NMe2 = dimethyl amine), have been synthesized by reacting lithium salts with aliphatic carboxylic acids using a solvothermal method. The structures of all the three complexes have been determined by single crystal X-ray diffraction studies. The single crystal structure analysis revealed that complex 1 has a three-dimensional framework, whereas complex 2 has 2D sheets and complex 3 has 1D chains. In addition, these lithium complexes contain various inorganic motifs with a tetramer in 1 and 2, and discrete tetrahedra in 3 and have further been connected through organic ligands to construct multidimensional structures. Further, the electrochemical properties of complexes 1–3 have been studied to evaluate these compounds as electrode materials for lithium ion batteries with discharge capacities of around 100 mA h g(-1) in the first thirty cycles.

Synthesis, Structures and Electrochemical Properties of Lithium 1,3,5-Benzenetricarboxylate Complexes

“…During the first cycle, the rapid decrease in charge/ discharge capacities of complex 3 and complex 4 might be due to the irreversible electrochemical nature of the lithium complexes, which is quite common for lithium-containing compounds. These results reveal that both lithium coordination polymers have active electrochemical properties and display similar capacity, in comparison to previously reported studies where they ranged from about 100 to 600 mAhg −1 [33,34,35,36,37,38,39,40,41,42,43,44].…”

“…There have been few studies on lithium CPs with interesting electrochemical behaviors that could be used as electrodes in lithium ion batteries [33,34,35,36,37,38,39,40,41,42,43,44]. For the first time, two CPs of lithium terephthalate (Li 2 C 8 H 4 O 4 ) and lithium trans – trans –muconate (Li 2 C 6 H 4 O 4 ) displayed high electrode capacities up to 300 mAhg −1 [34].…”

Molecular and heterogenized dinuclear Ir-Cp* water oxidation catalysts bearing EDTA or EDTMP as bridging and anchoring ligands

“…The crystal structure of Ir-EDTA exhibits many similarities with that of Ir-H4-EDTMP. [97][98][99][100] and transition [101][102][103][104][105][106][107][108][109][110] metals, as well as for some lanthanides [111] and actinides [112].…”

Crystal structure and Hirshfeld surface analysis of (succinato-κO)[N,N,N′,N′-tetrakis(2-hydroxyethyl)ethylenediamine-κ5 O,N,N′,O′,O′′]nickel(II) tetrahydrate

“…The metal-ion geometries of coordination compounds can easily be identified. Transition metal atoms can be bridged by aliphatic or aromatic dicarboxylate ligands to produce chains, layers and frameworks (Pavlishchuk et al, 2011;Cheng et al, 2013;Ş en et al, 2017). In addition, many transition and heavy metal cations play an important role in biological processes in the formation of many vitamins and drug components.…”