Effect of the Spacer Chain Length of Organic Dicarboxylic Acid on the Supramolecular Assembly of Two Ternary Zinc (II) Coordination Polymers Derived from Mixed Ligands

Abstract

Two new Zn II coordination polymers (CPs), [Zn 2 (SA) 2 (L) 2 ] n (1) and [Zn(AA)(L)] n (2) [L = 1,6-bis(benzimidazol-1-yl)hexane, H 2 SA = succinic acid, H 2 AA = adipic acid], were synthesized via hydrothermal method and characterized by elemental analysis, infrared spectroscopy, and single-crystal X-ray diffraction. CP 1 possesses a sql network, which is further extended into a 3D supramolecular skeleton by non-classical C-H···O hydrogen bonding interactions. CP 2

N‐donor‐induced Two Co(II) Coordination Polymers Derived from the Flexible Citraconic Acid as Photocatalysts for the Decomposition of Organic Dyes

“…The PXRD patterns of 1 and 2 are completely identical before and after catalysis (Figure S3 and Figure S4). This result demonstrates that 1 and 2 may be reusable for the catalysts to reduce toxic organic dyes concentration in the industrial wastewater [54–56] …”

“…The photogenerated hole can capture one electron from the water molecule to give ⋅OH radical. These generated ⋅OH radicals could decompose the dye effectively into CO 2 , H 2 O and some other degradation products to complete the photodegradation process [55–57] . H 2 O 2 is not only an electron acceptor to promote the formation of ⋅OH radicals, but also can effectively prevent the recombination of holes and electrons [28] .…”

“…These generated •OH radicals could decompose the dye effectively into CO 2 , H 2 O and some other degradation products to complete the photodegradation process. [55][56][57] H 2 O 2 is not only an electron acceptor to promote the formation of * OH radicals, but also can effectively prevent the recombination of holes and electrons. [28] To further confirm a possible mechanism of the photocatalysis process, the radical trapping experiments were carried out in the presence of 2propanol (a capture agent of hydroxyl radical) (Figure S5).…”

“…This result demonstrates that 1 and 2 may be reusable for the catalysts to reduce toxic organic dyes concentration in the industrial wastewater. [54][55][56] Under UV/vis light irradiation, the catalyst can be induced to generate electron transfer from the highest occupied molecular orbital (HOMO) to the lowest unoccupied molecular orbital (LUMO) and then form holes. [53,54] But the excited state of electron in the LUMO was easily lost.…”