Correction: A photochromic zinc-based coordination polymer for a Li-ion battery anode with high capacity and stable cycling stability.

Correction for 'A photochromic zinc-based coordination polymer for a Li-ion battery anode with high capacity and stable cycling stability' by Shu-Biao Xia et al., Dalton Trans., 2018, 47, 13222-13228, DOI: 10.1039/C8DT02930J.

A photochromic zinc-based coordination polymer for a Li-ion battery anode with high capacity and stable cycling stability.

Rechargeable Li-ion batteries (LIBs) are currently the dominant power source for electric vehicles and portable electronic devices, and for small-scale stationary energy storage. However, one bottleneck of the anode materials for LIBs is the poor cycling performance caused by the fact that the anodes cannot maintain their integrity over several charge-discharge cycles. In this article, a zinc-based two-dimensional coordination polymer [Zn(bcbpy)0.5(PTA)(H2O)] (Zn-BCP) has been synthesized (H2bcbpy·2Cl = 1,1'-bis(3-carboxylatobenzyl)-(4,4'-bipyridinium) dichloride, PTA = terephthalic acid), which was characterized by single-crystal X-ray diffraction, powder X-ray diffraction, infrared spectroscopy and thermogravimetric analysis. Because of the presence of electron-deficient bipyridinium moieties, Zn-BCP can easily undergo photoinduced electron transfer and eye-detectable photochromic behavior. Moreover, its luminescence can be switched by UV-Vis light irradiation. When Zn-BCP acts as an anode material for lithium ion batteries, it can deliver a high reversible capacity of 386.2 mA h g-1 at 100 mA g-1 after 100 cycles and a high capacity retention of 93.1% after 1000 cycles at a high rate of 200 mA g-1, which is supposed to be due to the flexible structure characteristic of the proposed anode. The high capacity may be mainly ascribed to rich insertion sites arising from the aromatic ligands and all of the aromatic ligands are taking part in lithium storage.

Anion-Controlled Architecture and Photochromism of Naphthalene Diimide-Based Coordination Polymers.

Three new cadmium coordination polymers, namely [Cd(NO3)2(DPNDI)(CH3OH)]·CH3OH (1), [Cd(SCN)2(DPNDI)] (2), and [Cd(DPNDI)2(DMF)2]·2ClO4 (3) (DPNDI = N,N-di(4-pyridyl)-1,4,5,8-naphthalene diimide, DMF = N,N-dimethylformamide) have been synthesized by reactions of DPNDI with Cd(NO3)2, Cd(SCN)2, and Cd(ClO4)2, respectively. Compound 1 is a one-dimensional coordination polymer with strong lone pair-π interactions between the coordinated NO3- anions and the imide ring of DPNDI; while 2 is a two-dimensional network with a (4, 4) net topology. In the case of 3, due to the presence of uncoordinated perchlorate counter ions, it exhibits a non-interpenetrated square-grid coordination polymer containing one-dimensional rhomboid channels. The structural diversity in these compounds is attributed to different coordination abilities and geometries of counter anions. Due to the presence of electron-deficient NDI moiety, the photochromic behavior of these compounds was studied. Interestingly, only compounds 1 and 3 exhibit color changes under light irradiation. The influence of the anions on the photochromism process of the NDI-based materials has been discussed.

Theoretical studies on cycloaddition reactions between 2-azoniaallene cations and olefins.

The mechanisms of cycloaddition reactions between 2-azoniaallene cations and olefins have been explored at the B3LYP/6-31G level. It is found that the positive charge in 2-azoniaallene makes the reaction more complicated. For the reactions between olefins with Cl groups or CH(3) groups and 2-azoniaallene, the typical carboniums have been located along the reaction path. In addition, for the reactions between 1,1-dimethylethene and 1,3-dichrolo-2-azoniaallene, different paths and products have been rationalized and verified.