DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 31
·10760-10768
·
IF 4
Fen You,Jixing Wang,Hui Liu,Xiaohui Kang,Xiaochao Shi
A series of rare-earth metal bis(alkyl) complexes have been prepared via protonolysis reactions of tris(aminobenzyl) complexes (Ln(CH2C6H4N(Me)2-o)3) with phosphine-functionalized amidinated ligands (DippNCN(CH2)nPPh2, n = 2 (L1-H) and n = 3 (L2-H)). The X-ray diffraction of P2-Sc (DippNCN(CH2)3PPh2Sc(CH2C6H4N(Me)2-o)2) showed the un-coordination of the diphenylphosphine group due to the inherent saturation of the central metal ion. In conjunction with [Ph3C][B(C6F5)4], all the rare-earth metal complexes showed a high catalytic activity for the polymerization of 1,3-conjugated dienes (isoprene, β-myrcene and β-farnesene), affording highly 3,4-regular polymers (up to 100% 3,4-) with high molecular weight and narrow molecular weight distribution. After the abstraction of the alkyl moiety –CH2C6H4N(Me)2-o of P1-Sc by [Ph3C][B(C6F5)4], the species with the coordination of the diphenylphosphine group to the central metal probably formed, as shown in the 31P NMR spectra and DFT calculation results, and it might serve as the true active species in the 3,4-selective polymerization of 1,3-conjugated dienes.
研究领域:
化学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
Catalysis Science & Technology
·
2013
·Vol. 4
·期 3
·773-779
·
IF 3.753
Qinzhuo Zhou,Bo-Geng Li,Suyun Jie,Na Zheng
A series of phosphine-containing cobalt complexes [CoCl2(PRPh2)2, R = Ph (1), Cy (2), nPr (3), Et (4), Me (5), H (6)] has been used for the highly active and stereospecific polymerization of 1,3-butadiene upon activation with ethylaluminum sesquichloride (EASC). The high catalytic activities and polybutadienes with high cis-1,4 selectivity were obtained in the solution polymerization in toluene. The conversion of butadiene and the microstructure and molecular weight of the resulting polymers were affected by reaction parameters and the R group on the phosphine ligand. The dispersion medium was also a sensitive factor for the current catalytic systems, influencing the catalytic activity and properties of products. In comparison with the solution polymerization in toluene, the heterogeneous polymerization in isooctane yielded slightly lower catalytic activity, cis-1,4 content and molecular weight under similar reaction conditions.
研究领域:
高分子化学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Jingjing Zhai,Fen You,Suting Xu,Ao Zhu,Xiaohui Kang,Yat-Ming So,Xiaochao Shi
A PNP-pincer ligand provides a versatile ligation framework, which is highly useful in organometallic chemistry and catalytic chemistry. In this work, by a de novo strategy, a simple and efficient synthetic pathway, has been developed to prepare the new iminodibenzyl-based PNP pincer proligand imin-RPNP(Li or H) (R = isopropyl, phenyl). By employing salt metathesis or direct alkyl elimination, we successfully synthesized a series of iminodibenzyl-PNP rare-earth-metal (Ln = Sc, Y, Dy, Ho, Er, Tm, Lu) complexes and characterized them by NMR and X-ray diffraction analyses. Upon addition of a borate and triisobutylaluminum (TIBA), the rare-earth-metal complexes 2-Y, 2-Dy, 2-Ho, 2-Er, and 2-Tm bearing the imin-PhPNP ligand exhibited unexpectedly high 3,4-selectivity (up to 95%) for the polymerization of 1,3-dienes (isoprene and myrcene); in particular, the chosen yttrium complex 2-Y promoted the 1,3-diene polymerization in a living manner. A computational study suggested that the sterically congested configuration around the metal center imposed by the imin-RPNP ligand might be the main reason for this unusual selectivity.
研究领域:
有机金属化学
·
催化化学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Xuyang Yan,Wentao Chen,Wang Xie,Xiuling Wang,Yat-Ming So,Xiaochao Shi
We have synthesized a series of binuclear rare-earth metal complexes bearing the newly designed enamino-oxazolinate ligands that feature bridging para-phenyl, meta-phenyl, 1,5-naphthalenyl, and 1,5-anthracenyl moieties. NMR and X-ray diffraction analyses confirmed the binuclear structures of the obtained complexes with two enamino-oxazolinate-metal units located at a trans position against the bridged aryl plane. After activation by [Ph3C][B(C6F5)4], all the rare-earth metal complexes served as efficient catalysts for isoprene polymerization, producing polymers with high cis-1,4 regularity (up to 96.1%) and high molecular weight. The steric and electronic effects exerted on the active metal centers, as well as the radius of metal centers, were the major contributing factors for determining both the catalytic activity and cis-1,4-selectivity of the binuclear catalytic systems. Compared to its mononuclear analogue, the binuclear yttrium catalytic system with a para-phenyl bridge exhibited a higher thermostability and catalytic efficiency during polymerization, revealing a special binuclear effect in this binuclear catalytic system.
研究领域:
化学
·
材料科学
·
催化反应
✓ 已验证
DOI
PubMed
高影响因子
ORGANOMETALLICS
·
2022
·
IF 3.837
Jixing Wang,Suting Xu,Xiang Hu,Yanchen Huo,Xiaochao Shi
Rare-earth metal complexes bearing pyridyl-functionalized amidinate ligands were synthesized, and upon activation by a borate, all of these complexes exhibited high catalytic activities for the living polymerization of isoprene and myrcene to generate trans-1,4 polymers (≤96.8% for polyisoprene and ≤94.8% for polymyrcene). A metal dependence effect was observed, and the scandium complexes with a smaller central ion afforded polymers with the highest trans-1,4-regularity. Moreover, the 3-Sc/[PhMe2NH][B(C6F5)4] binary system also promoted block copolymerization of isoprene and ε-caprolactone, affording the copolymers that consisted of a nonpolar polyisoprene block possessing trans-1,4-microstructure and a polar poly(ε-caprolactone) block.
研究领域:
化学
·
高分子科学
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR RAPID COMMUNICATIONS
·
2024
·Vol. 45
·期 22
·2400486
·
IF 4.2
Liying Shen,Jingjing Zhai,Yanchen Huo,Xiuling Wang,Xiaochao Shi
A series of binuclear rare-earth metal complexes based on the ligands containing bis(phosphinophenyl)amido-PNP unit are successfully synthesized. All the ligands and the corresponding binuclear complexes are fully characterized by NMR spectra ( 1 H, 13 C, and 31 P). In conjunction with [Ph 3 C][B(C 6 F 5 ) 4 ], all the binuclear complexes exhibited high catalytic activity and high cis -1,4-selectivity (>99%) toward the polymerization of 1,3-conjugated dienes (isoprene, β-myrcene and β-farnesene) with excellent livingness at room temperature or even 80 °C.
研究领域:
有机化学
·
高分子化学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymers
·
2021
·Vol. 13
·期 19
·3329
·
IF 4.329
Beibei Wang,Heng Liu,Tao Tang,Xuequan Zhang
Highlycis-1,4 selective (up to 98%) coordination–insertion polymerization of 1,3-butadiene (BD) has been achieved herein using acenaphthene-basedα-diimine cobalt complexes. Due to the presence of intra-ligand π-π stacking interactions, the complexes revealed high thermostability, affording polybutadiene products in high yields. Moreover, all of the obtained polymers possessed a relatively narrow molecular weight distribution as well as high molecular weight (up to 92.2 × 104Dalton). The molecular weights of the resultant polybutadienes could be finely tuned by varying polymerization parameters, including temperature, Al/Co ratio, etc. Moreover, the copolymerization of butadiene with polar monomer 2-(4-methoxyphenyl)-1,3-butadiene (2-MOPB) was also successfully realized to produce a type of polarcis-1,4 polybutadiene (cis-1,4 content: up to 98.1%) with a range of 2-MOPB content (0.46–1.83%). Water contact angle measurements indicated that the insertion of a polar monomer into a polymer chain could significantly improve the polymer’s surface property.Keywords:cis-1,4 selective;1,3-butadiene;α-diimine cobalt complexes;copolymerization;π-π stacking interactions
研究领域:
高分子化学
·
配位化学
✓ 已验证
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 17
·8277-8283
·
IF 3.925
Yanchen Huo,Xiang Hu,Jixing Wang,Hongfan Hu,Xiaochao Shi
Amido-trihydroquinoline ligated rare-earth metal complexes have been synthesized, and in combination with a borate, all these complexes (except 2-Sc) showed moderate catalytic activities for isoprene polymerization to generate 1,4-enriched polyisoprene. In particular, the 2-Y-based catalytic system promoted the isoprene polymerization in a well-controlled manner. The alkylaluminium (AlR3, R = Me, Et, iBu) exerted a different influence on the polymerization, and AlMe3 enhanced not only the catalytic reactivity but also the 1,4-selectivity significantly. Considering the influence of the polar sequence on improving the surface property of the non-polar polymer, we further successfully realized the polymerization of ε-caprolactone and its block copolymerization with isoprene by utilizing the active yttrium-polyisoprene species as the marcointiator. The fact that the higher content of the hydrophilic PCL sequence in the copolymer gave a lower WAC, proved the tunable modification of the copolymer's surface hydrophilicity.
研究领域:
有机化学
·
高分子化学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）