Bis-(salicylaldehyde-benzhydrylimino)nickel complexes with different electron groups: crystal structure and their catalytic properties toward (co)polymerization of norbornene and 1-hexene

He, Xiaohui; Tu, Guangshui; Zhang, Feng; Huang, Shengmei; Cheng, Changwen; Zhu, Chuanyi; Duan, Yapeng; Wang, Suli; Chen, Defu

doi:10.1039/c8ra06561f

Cited by 11 publications

(2 citation statements)

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“…According to Table 4, the temperature in which 10 % weight was lost (T 10w ) decreased as 1H content was increased in the polymer chain. In thermal decomposition of the copolymer samples temperature dropped, but it still had good thermal stability [80] …”

Section: Resultsmentioning

confidence: 99%

Microstructural, Thermal and Electrical Properties of Methyl Methacrylate and 1‐Hexene Copolymers Made by Dinuclear Ni‐Based Catalysts

2021

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Herein, we investigate the dinuclearity effect of α‐diimine Ni‐based catalysts, N1 and N2 bearing different backbone on methyl methacrylate/1‐hexene (MM‐1H) copolymerization and characterize the copolymers microstructures using FT‐IR and NMR. The monomer reactivity ratio (r) is calculated using three different methods, a high reactivity ratio for MM (r1=9.9611), whereas a low reactivity ratio is obtained for 1H (r2=−0.0226). As determined by NMR analyses, up to 96 % of the MM incorporated into the main chain. Thermal copolymer properties are studied by DSC and TGA analyses, and the results are compared with those of Poly (methyl methacrylate) (PMMA). The higher content of MM in the copolymer backbone and the higher Tg for the copolymer samples (95.5 to 105.6 °C) were obtained. TGA shows that the degradation temperature of copolymers with higher 1H content progression reduced by about 10 % weight‐loss for N1 (327 to 240 °C) and N2 (325 to 236 °C). We are using a novel method with a low‐cost and speedy determination of polymer conductivity in both solid and liquid phases, which indicates the semi‐conductivity property of poly(MM‐1H) using corona discharges under the air atmosphere. Synthesized graphene‐poly(MM‐1H) nanocomposite shows the electrical conductivity augment from 3.45 μS of the poly(MM‐1H) to 30.42 μS for its nanocomposite.

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Section: Resultsmentioning

confidence: 99%

Microstructural, Thermal and Electrical Properties of Methyl Methacrylate and 1‐Hexene Copolymers Made by Dinuclear Ni‐Based Catalysts

2021

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“…A series of bis‐(salicylaldnaphthylmethyleneimino)Ni(II) complexes bearing different electron groups on substituted salicylaldnaphthylmethyleneimine ligands were synthesized as follows (Scheme ):…”

Section: Methodsmentioning

confidence: 99%

Nickel complexes bearing different electron groups on substituted salicylaldnaphthylmethyleneimine ligands: Syntheses and their catalytic performance for (co)polymerization of norbornene

Zhu

Huang

et al. 2020

Applied Organom Chemis

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Novel nickel complexes bearing different electron groups on substituted salicylaldnaphthylmethyleneimine ligands, bis‐(salicylaldnaphthylmethyleneimino)Ni(II) (Ni{(3‐R1)(5‐R2)C6H2(O)CH[N (naphthyl‐CH2)]}2 Ni1: R1 = H, R2 = H; Ni2: R1 = H, R2 = CH3; Ni3: R1 = H, R2 = Br; Ni4: R1 = H, R2 = OCH3; Ni5: R1 = CH3, R2 = H; Ni6: R1 = Br, R2 = H), were synthesized. Ni2, Ni3, Ni5, and Ni6 are clearly characterized by single‐crystal X‐ray diffraction. Co‐polymerization of norbornene (NB) with 5‐norbornene‐2‐methylene butyl ether (BN) was carried out in toluene with the aforesaid complexes as catalyst precursors and B(C6F5)3 as the co‐catalyst. Catalyst activity, molecular weight, thermal stability, solubility, regularity, and optical transparency were investigated, and the mechanism of the electron groups changing catalyst performance is explained. All catalysts show high activity toward co‐polymerization (up to 3.53 × 105 gpolymer molNi−1 h−1). Ni3 shows the highest activity and Ni5 shows the highest insertion rate (up to 37.6%). The obtained poly(NB‐co‐BN)s are confirmed to be vinyl‐addition‐type co‐polymers, and they are noncrystalline. The co‐polymers exhibited excellent thermal stability and processability (Td ≥ 400 °C, Tg < 240 °C), optical transparency (up to 90%), and good solubility.

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Recent Studies on Single Site Metal Alkoxide Complexes as Catalysts for Ring Opening Polymerization of Cyclic Compounds

Kayan

2020

Catal Surv Asia

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Bis-(salicylaldehyde-benzhydrylimino)nickel complexes with different electron groups: crystal structure and their catalytic properties toward (co)polymerization of norbornene and 1-hexene

Abstract: Ni(ii) complexes were successfully synthesized and characterized, and were highly active toward (co)polymerization of norbornene, and the 1-hexene content could be controlled.

Cited by 11 publications

References 50 publications

Microstructural, Thermal and Electrical Properties of Methyl Methacrylate and 1‐Hexene Copolymers Made by Dinuclear Ni‐Based Catalysts

Microstructural, Thermal and Electrical Properties of Methyl Methacrylate and 1‐Hexene Copolymers Made by Dinuclear Ni‐Based Catalysts

Nickel complexes bearing different electron groups on substituted salicylaldnaphthylmethyleneimine ligands: Syntheses and their catalytic performance for (co)polymerization of norbornene

Recent Studies on Single Site Metal Alkoxide Complexes as Catalysts for Ring Opening Polymerization of Cyclic Compounds

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