Article
Chemistry, Multidisciplinary
J. L. S. Milani, A. F. P. Biajoli, F. I. Batista, R. S. Oliboni, O. L. Casagrande
Summary: A series of new Cr(III) complexes were successfully synthesized and showed moderate activity in ethylene oligomerization, with a uniform distribution of oligomers and polymer production ranging from 1.2% to 9.8%. The catalytic activity is mainly controlled by electronic effects at the thioether/imine groups.
NEW JOURNAL OF CHEMISTRY
(2021)
Article
Chemistry, Inorganic & Nuclear
Jiliang Tian, Zhihao Gao, Yongxin Liu, Pierre Braunstein, Shaofeng Liu, Zhibo Li
Summary: The synthesis and catalytic properties of a titanium trichloride complex with an N-H group-containing ligand were investigated. The catalyst demonstrated unprecedented activity and produced polyethylene with different distributions when compared to the analogous compound without the N-H group.
INORGANIC CHEMISTRY FRONTIERS
(2023)
Review
Chemistry, Multidisciplinary
Heng Wang, Jialin Wen, Xumu Zhang
Summary: Asymmetric hydrogenation of double bonds is an effective method for preparing chiral molecules, with noble metals and bidentate ligands showing remarkable reactivity. The development of chiral tridentate ligands has become increasingly important, enabling both reactivities and stereoselectivities in asymmetric hydrogenation. While noble metal catalysts with chiral tridentate ligands have made significant achievements, there is still a high demand for designing chiral tridentate ligands for earth abundant metal catalysts.
Article
Chemistry, Inorganic & Nuclear
Ashley J. Schuman, Sarah F. T. Robey, Eileen C. Judkins, Matthias Zeller, Tong Ren
Summary: This study describes the synthesis and characterization of macrocyclic Cr-III mono-alkynyl complexes, which were obtained in high yields through chemical reactions. The single crystal X-ray diffraction confirmed the desired structure of these complexes. These complexes exhibit different characteristics in absorption and emission spectra compared to bis-alkynyl complexes.
DALTON TRANSACTIONS
(2021)
Article
Chemistry, Multidisciplinary
Taro Shigeta, Shinjiro Takano, Tatsuya Tsukuda
Summary: The structure of the new sulfur-containing gold cluster Au18S2(STipb)(12) was revealed through single-crystal X-ray diffraction analysis, showing a deformed octahedral Au-6 core clutched by two tridentate S[Au-2(STipb)(2)](3) units in an interlocked manner.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Inorganic & Nuclear
Alexandros Mortis, Caecilia Maichle-Moessmer, Reiner Anwander
Summary: (Me3TACN)YMe3 complex is synthesized from (Me3TACN)YCl3 or [YMe3]n, and reacts with trimethylchlorosilane to form mixed methyl/chlorido complexes [(Me3TACN)YMe3-xClx]. The reaction of heteroleptic complex [(Me3TACN)YMe2Cl]with dibenzyl ketone was investigated.
Article
Chemistry, Inorganic & Nuclear
Felix Geist, Sebastian Martinez, Jacqueline Ramler, Kai Oberdorf, Lisa Braendler, Sascha Reith, Crispin Lichtenberg
Summary: Bis[dibenzobismepine], a dibismuthane composed of two bismepine units, was synthesized and characterized. Its reactions with diphenyl dichalcogenides, dibenzoylperoxide, and elemental chalcogens were investigated, and the products were isolated and characterized. The potential of these compounds to act as tridentate chalcogen/olefin ligands with bismuth atoms as structure-determining elements in the backbone was explored using theoretical approaches.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Organic
Andrew M. Camelio, Arkady Krasovskiy, Brad Bailey, Anna Davis
Summary: A mild and broadly applicable method has been developed for the synthesis of mono- and bis-carbodiimides, allowing for the rapid generation of a library of novel amidinines, guanidines, and phosphaguandines in good yield and high purity.
JOURNAL OF ORGANIC CHEMISTRY
(2022)
Article
Chemistry, Inorganic & Nuclear
Aleksei O. Tolpygin, Anastasia A. Sachkova, Alexander D. Mikhailychev, Anatoly M. Ob'edkov, Tatyana A. Kovylina, Anton Cherkasov, Georgy K. Fukin, Alexander A. Trifonov
Summary: A series of coordination compounds were synthesized and demonstrated high catalytic activity and stability in catalyzing the polymerization of isoprene and 1-heptene.
DALTON TRANSACTIONS
(2022)
Article
Chemistry, Inorganic & Nuclear
Naresh Kumar, Sonika Asija, Yogesh Deswal, Deepak Kumar, Deepak Kumar Jindal, Lokender Kumar, Sandeep Kumar, Jai Devi
Summary: In this study, a series of diorganotin(IV) complexes with the general formula R2SnL1-4 were synthesized by reacting R2SnCl2 (R = Me, Et, Bu, and Ph) with hydrazone ligands (H2L1-4). Various analytical techniques were used to determine the structures of the synthesized compounds. The compounds showed better antimicrobial activity than the free ligands, with complexes 8, 12, and 20 exhibiting the highest activity. Additionally, the synthesized compounds showed significant anticancer activity against three cancer cell lines, with complexes 5, 6, and 8 being the most active.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Kyeonghun Kim, Saira Nayab, Yerim Cho, Hyewon Jung, Hyeonuk Yeo, Hyosun Lee, Sang-Ho Lee
Summary: A series of Co(ii) complexes supported by Schiff base ligands were designed and synthesized. After activation with modified methyl aluminoxane (MMAO), all the Co(ii) complexes catalyzed the polymerization of norbornene (NB) to yield vinyl-type polynorbornenes (PNBs) with high activities at 25°C.
Article
Chemistry, Multidisciplinary
Mainak Karmakar, Antonio Frontera, Shouvik Chattopadhyay
Summary: The synthesis and X-ray characterization of two new dinuclear Zn complexes using a tridentate N2O donor reduced Schiff base and acetate or azide as the anionic coligands have been described. The complexes form infinite 1D assemblies governed by H-bonding interactions in the solid state. The assemblies have been energetically analyzed using density functional theory (DFT) calculations and several computational tools.
Article
Chemistry, Inorganic & Nuclear
Kunwoo Lee, Nara Kim, Kyung-Bin Cho, Yunho Lee
Summary: A phosphide nickel(II) phenoxide pincer complex reacts with CO to form a nickel(0) monocarbonyl complex with a phosphinite moiety. The reaction involves a 2-electron reduction of nickel(II) induced by CO coordination, resulting in the formation of a P-O bond. Kinetic experiments show that phenolate species with electron-withdrawing groups react faster than those with electron-donating groups.
INORGANIC CHEMISTRY
(2023)
Review
Chemistry, Organic
Shulei Wu, Zaoduan Wu, Qianyi Ge, Xing Zheng, Zehua Yang
Summary: This review summarizes the significant progress in the research studies of the antitumor activity of pincer and related metal complexes, providing a reference for designing novel metal coordination drug candidates with promising antitumor activity.
ORGANIC & BIOMOLECULAR CHEMISTRY
(2021)
Article
Chemistry, Inorganic & Nuclear
Xueli Wang, Junnian Wei, Zhenfeng Xi
Summary: A bulky tridentate bis(3-methyl-5-arylhydroxyphenyl)phenylphosphine ligand 1 was synthesized and reacted with TiCl3(THF)3 to obtain bis{Tipp[O, P, O] titanium(THF)0.59(Et2O)0.41(mu-chloro)} 2. Reduction of 2 with KC8 in toluene or C6D6 yielded two arene-bridged dititanium complexes {Tipp[O, P, O]}2 titanium (mu-eta 6:eta 6-C6H5Me) 3 and {Tipp[O, P, O]}2 titanium (THF)0.58(Et2O)0.42(mu-eta 6:eta 6-C6D6) 4, respectively. The structures of complexes 3 and 4 featured an inverted sandwich-type structure with distorted aromatic rings. Density functional theory calculations provided insights into the loss of aromaticity in the distorted aromatic rings.
Article
Chemistry, Multidisciplinary
Jinbo Zhang, Lebin Wang, Shaofeng Liu, Zhibo Li
Summary: Organophosphazenes combined with triethylborane were used as binary organocatalysts for the copolymerization of CO2 and epoxides, showing high activity and selectivity dependent on the nature of phosphazenes. 2,4,6-Tris[tri(1-pyrrolidinyl)-iminophosphorane]-1,3,5-triazine exhibited unprecedented efficiency in producing CO2-based polycarbonates at 1 MPa of CO2 and room temperature.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Polymer Science
Jinfeng Shi, Zhengyang Liu, Na Zhao, Shaofeng Liu, Zhibo Li
Summary: This contribution demonstrates an efficient strategy to synthesize well-defined functional polysiloxanes using phosphazene as an organocatalyst. Linear poly(dimethylsiloxane)s (PDMSs) with different end-groups were successfully synthesized by C3N3-Me-P3-catalyzed ring-opening polymerization (ROP) and subsequent end-capping reactions. The resulting PDMSs were characterized by various techniques and showed narrow distributions and well-defined structures.
Article
Polymer Science
Fen You, Xiaohui Kang, Masayoshi Nishiura, Jingjing Zhai, Suting Xu, Jixing Wang, Xiaochao Shi, Zhaomin Hou
Summary: This study reports the living and highly 3,4-isoselective polymerization of biobased monomer beta-farnesene using a phosphine-functionalized fluorenyl-ligated yttrium catalytic system. The coordination of the phosphine group plays a pivotal role in the regio- and stereoselectivity of the polymerization. Block copolymers with specific properties were successfully prepared. This research is important for reducing petrochemical dependency.
Article
Chemistry, Physical
Lanxiao Zhao, Peng Deng, Xun Gong, Xiaohui Kang, Jianhua Cheng
Summary: This study demonstrated the catalytic ortho-regioselective C-H alkylation of alkoxy-substituted benzene derivatives with alkenes using a half-sandwich calcium alkyl complex as the precatalyst. The potential catalytic reaction intermediates were isolated and X-ray structurally characterized, with DFT calculations elucidating the different reaction profiles of sp(2) and sp(3) C-H activations.
Article
Chemistry, Multidisciplinary
Jiliang Tian, Wenzheng Feng, Shaofeng Liu, Zhibo Li
Summary: A series of titanium amido complexes were synthesized using NNO-tridentate ligands, and subsequently converted into titanium dichloride complexes. These titanium dichloride complexes exhibited high activity and excellent control over molecular weight and distribution in ethylene homopolymerization reactions. Linear low-density polyethylenes with ultrahigh molecular weights and narrow distributions were successfully synthesized by incorporating 1-octene as a comonomer.
CHINESE JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Inorganic & Nuclear
Yu Pan, Xinxin Jiang, Xiaohui Kang, Xin Hou, Chunteng Wan, Xuezhi Song, Wa-Hung Leung, Yat-Ming So
Summary: In this study, mononuclear rare-earth metal alkyl complexes supported by tetradentate dianionic bis(amino-oxazoline) ligands were synthesized and their reactivity towards small molecules and catalytic performance on ring-opening polymerization were investigated.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Inorganic & Nuclear
Yanhong Xing, Lingling Xu, Shaofeng Liu, Zhibo Li
Summary: Two types of bifunctional amido-ether ligands were designed to support dinuclear group 4 metal complexes, and their structures and properties were characterized. Different conformations were observed for the Hf2 complex at room temperature, while only one conformation was observed for the Zr and Ti analogues. The activity and cooperativity of the metal complexes in the copolymerization of ethylene with 1-octene were evaluated, and syn-Zr2 showed the highest activity and significant cooperativity compared to other complexes.
INORGANIC CHEMISTRY
(2023)
Article
Polymer Science
Wenhui Ren, Fen You, Jingjing Zhai, Xiaohui Kang, Yat-Ming So, Xiaochao Shi
Summary: This study presents a single rare-earth metal catalyst that can promote the polymerization of isoprene and butadiene with unmatched stereoselectivity, resulting in polymers with different cis or trans structures. Moreover, the catalyst allows for the precise control of diblock and multiblock copolymers with differently stereoselective adjacent blocks. The mechanical properties of the produced block copolymers can be tailored by controlling the sequence length.
Article
Polymer Science
Lijian Xia, Anmin Tao, Jinyun Cui, Abin Sun, Ze Kan, Shaofeng Liu
Summary: In this study, a novel strategy was proposed to prepare silica/rubber composites for low roll resistance tires. The silica was modified using Si747 and the master batches were produced using the latex compounding technique. The effects of Si747 amount and pH value on the properties of the composites were systematically analyzed, and the ESBR/MAS composites with 15% Si747 demonstrated better dispersion and weaker Payne effect compared to the ESBR/MPS composites with 20% Si747. Moreover, the ESBR/MAS composites exhibited a better balance of lower rolling resistance and higher wet skid resistance.
Article
Chemistry, Physical
Ling Zhu, Shuang Li, Xiaohui Kang, Wenzhen Zhang, Yi Luo
Summary: Density functional theory calculations were performed to investigate the reasons for the different catalytic performances of phosphine-benzene sulfonate and α-diimine palladium complexes in the copolymerization of ethylene and methyl vinyl sulfone. The results showed that the phosphine-benzene sulfonate palladium complex had less structural deformations, leading to the favorable 2,1-selective insertion of methyl vinyl sulfone. In contrast, the α-diimine palladium complex had a stronger O-backbiting interaction, which hindered the insertion of ethylene. These computational results could provide insights for the design of transition metal copolymerization catalysts.
Article
Polymer Science
Mengting Zang, Wenyao Cao, Xingwang Zhang, Shaofeng Liu, Zhibo Li
Summary: Catalysts play a crucial role in driving innovation in sustainable polymers by providing reactivity and selectivity. The synthesis and characterization of a series of Al complexes with N,N-bidentate amino-quinoline ligands are described, along with their significant applications in ring-opening polymerization (ROP) of e-caprolactone (e-CL). These complexes exhibited high reactivity and control over molar mass and dispersity, leading to the synthesis of polycaprolactones (PCLs) with high molecular weights. Immortal catalysis was achieved with a low loading of the Al complex, resulting in PCLs with predictable Mns, low dispersities, and end groups.
EUROPEAN POLYMER JOURNAL
(2023)
Article
Chemistry, Inorganic & Nuclear
Fen You, Jixing Wang, Hui Liu, Xiaohui Kang, Xiaochao Shi
Summary: A series of rare-earth metal bis(alkyl) complexes were synthesized through protonolysis reactions of tris(aminobenzyl) complexes with phosphine-functionalized amidinated ligands. These complexes showed high catalytic activity for the polymerization of 1,3-conjugated dienes, resulting in highly 3,4-regular polymers with high molecular weight and narrow molecular weight distribution. The coordination of the diphenylphosphine group to the central metal was observed, which may serve as the true active species in the 3,4-selective polymerization of 1,3-conjugated dienes according to 31P NMR spectra and DFT calculation results.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Inorganic & Nuclear
Han Lu, Xiaohui Kang, Hang Yu, Wenzhen Zhang, Yi Luo
Summary: This paper proposes a novel method for molecular representation and constructs prediction models of the reaction energy profile based on regression algorithms for palladium- and nickel-catalyzed ethylene polymerization. The models show high accuracy with respect to theoretical and experimental data and are convenient for training and utilization. The results suggest that this featurization method could be applied to more organometallic reactions and pave the way for efficient catalyst design.
DALTON TRANSACTIONS
(2023)
Article
Polymer Science
Jiliang Tian, Xingwang Zhang, Shaofeng Liu, Zhibo Li
Summary: This study developed metal catalysts with high activity and thermal stability for the polyolefin industry. Using newly synthesized ligands and chromium complexes, these catalysts exhibited unprecedented activity and excellent thermal stability while only requiring a small amount of MAO as a cocatalyst.
