Structural diversity of Mn(ii), Zn(ii) and Pb(ii) coordination polymers constructed from isomeric pyridylbenzoate N-oxide ligands: structures and electrochemical properties

Abstract

Several new coordination polymers (CPs), [MnIJ4, 2 (H 2 O) 2 ] n (1), [Zn(4, 4,benzoic acid N-oxide), have been successfully synthesized and characterized by elemental analyses, IR spectroscopy, thermogravimetric analysis and single crystal X-ray diffraction. Structural analysis shows that complex 1 features a two-dimensional (2D) layer with a 6 3 topology. Complexes 2 and 3 present a 2D layer architecture with a 4•8 2 topology. Complex 4 presents an unusual onedimensional (1D) chain constructed with linear trinuclear secondary building units (SBUs). Complex 5 has a zero-dimensional (0D) structure which is further connected to form a 2D supramolecular network through O-H⋯O hydrogen bonding. Complex 6 exhibits a 2D layer which is further connected by π⋯π interactions to produce a three-dimensional (3D) supramolecular framework with 1D opening channels. Moreover, as an anode material, complex 6 exhibits a relatively high irreversible capacity of about 860 mA h g −1 in the first discharge process and a reversible lithium storage capacity of up to 405 mA h g −1 at 100 mA g −1 after 100 cycles. The observation of good storage performance demonstrates that CPs are a prospective class of electrode materials for lithium ion batteries (LIBs).

Porous carbon with large surface area derived from a metal–organic framework as a lithium-ion battery anode material

“…We have been working on crystal engineering of porous frameworks and applied for energy storage. [16][17][18][19] As reported in our previous work, a porous microtube carbon was obtained by using a cadmium-based MOF (Cd-MOF) as template through directly pyrolysis, when treated as an anode materials, it displayed an improved capacity of 741 mA h g À1 and superior cyclic stability. 20 As part of continuous work, herein, we synthesized a two dimensional (3,6)-connected framework with rutile topology, namely [Cd 3 (TCPB) 2 (H 2 O) 2 (DMF) 2 ]$7H 2 O (H 3 TCPB ¼ 1,3,5-tri(4-carboxyphenoxy)benzene).…”

Recent progress in metal–organic polymers as promising electrodes for lithium/sodium rechargeable batteries

“…25 There are many present forms of metal nodes in redox-MOPs, including mono-valent alkali metal ions, multi-valent transitional metal ions, mix-valent metal ions, and mixed-kinds metal ions, and so on. 15,16,84,91,111,118,[134][135][136][137][138][139][140][141] Thus, it's necessary to discuss the possible choice of metal nodes in order to lay a foundation for future research. Considering that other sections mainly focus on the analysis of multi-valent metal nodes, the following paragraph will switch to those redox-MOPs characterized by ( 1) mono-valent metal ions and (2) mixed-kinds metal ions.…”

Structural Diversity of Zinc(II), Manganese(II), and Gadolinium(III) Coordination Polymers Based on Two Isomeric N-Heteroaromatic Polycarboxylate Ligands: Structures and Their Derived Mn2O3 for Lithium Storage Applications

“…Execution of coordination polymers (CPs) with novel designs have grabbed comprehensive attention owing to their captivating topological architectures, in addition to their potential applications in different disciplines of catalysis, gas filtration/separation, , luminescence, drug delivery, and so forth. Due to their applications in diverse areas of research, a massive number of CPs have been synthesized. − However, it is quite a challenge for crystal engineers to rationally fabricate new CPs with desired characteristic features which are strongly influenced by some synthetic factors like temperature, nature of solvent, pH value, etc., and even by the type of building block units such as ligands, cations, and some potential template moieties. − More importantly, the ligand is the key building block concerned with the design of new CPs, according to study of a great number of ligands with distinct properties and structures, which have been reported in the past few years. In view of searching for a suitable ligand, to tune the structure, property, and functionality of CPs, ample publications have been explored regarding the utility of organic ligand with its flexibility, length, and type of substituent; however, systematic tuning of the CPs with positional isomeric effect toward structural variations remains greatly unknown. − Moreover, a little work has been reported on the positional isomeric effect, which can demonstrate the investigation of the important factors of positional isomeric ligands for controlling structural differences.…”