Article
Chemistry, Inorganic & Nuclear
Leah Gajecki, Barbara Sawicka, David J. Berg, Allen G. Oliver
Summary: Previously reported carbazole-bis(tetrazole) (CzT(R)) ligands (where R = iPr and CH2-2,4,6-C6H2Me3) were used to synthesize air-stable, six-coordinate, octahedral bis-ligand Fe(II) complexes (CzT(R))(2)Fe. The synthesis and characterization of these complexes using H-1 nuclear magnetic resonance (NMR), X-ray crystallography, Mossbauer spectroscopy, and density functional theory (DFT) calculations are reported. The magnetic properties of the isopropyl derivative exhibit thermal induced spin crossover (SCO) while the slightly bulkier CH2-2,4,6-C6H2Me3 (CH(2)Mes) Fe complex shows different magnetic behavior with no SCO.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Rashmi Jena, Florian Benner, Francis Delano, Daniel Holmes, John McCracken, Selvan Demir, Aaron L. Odom
Summary: A room temperature stable complex, Y(NHAr*)(2), was prepared through KC8 reduction of ClY(NHAr*)(2), where Ar* = 2,6-(2,4,6-(Pr-i)(3)C6H2)C6H3. Through EPR evidence, it was shown that Y(NHAr*)(2) is a d(1) Y(ii) complex with significant delocalization of the unpaired electron density from the metal to the ligand. Interestingly, Y(NHAr*)(2) reacts as a radical donor towards (BuNC)-Bu-t, resulting in the formation of an unusual yttrium isocyanide complex, CNY(NHAr*)(2), as supported by spectroscopic evidence and single-crystal X-ray diffraction data.
Article
Chemistry, Physical
Mengchen Liu, Qianqian Yin, Shengnan Zhong, Huimin Sun, Yibo Wang, Shuai Liu, Jing Wang, Yanyan Diao, Feifei Yang, Tingting Xin
Summary: Two rare earth coordination polymers were synthesized using zwitterionic ligands. The structural characterization revealed differences in the coordination environments of La3+ ions in 1 and Gd3+ ions in 2. Both polymers exhibited good thermostability, decomposing at high temperatures to form La2O3 and Gd2O3. Magnetic properties of 2 were studied in the temperature range of 2-300 K.
JOURNAL OF MOLECULAR STRUCTURE
(2022)
Article
Chemistry, Inorganic & Nuclear
Vikesh Kumar Jha, Sanghamitra Das, Vasudevan Subramaniyan, Tapas Guchhait, Kishan Kumar Dakua, Sabyashachi Mishra, Ganesan Mani
Summary: In this study, a new pyrrole-based bis(phosphinimine) L1H was successfully synthesized and its two-coordinate mononuclear ionic complexes with copper and silver were characterized. The complexes exhibited planar chirality and a previously unknown pi-interaction between the pyrrole ring atoms and metal was observed in the structures.
DALTON TRANSACTIONS
(2021)
Article
Chemistry, Inorganic & Nuclear
Hui Guo, Dongjing Hong, Peng Cui
Summary: Tripodal tris(siloxide) ligand supported rare-earth metal complexes LLn(iii) (Ln = Ce, Pr, Tb, Y, Lu) were synthesized. The Ce(iii) complex was oxidized to Ce(iv) chloride complex and then reacted with tBuONa to form a Ce(iv) tert-butoxide complex, both of which showed substantial stability.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Physical
Ching-Pei Hsu, Chao-An Liu, Chu-Chiao Wen, Yi-Hung Liu, Ya-Fan Lin, Ching-Wen Chiu
Summary: This study reports the generation of stable chiral alkyl aluminum cationic complexes with high Lewis acidity and catalytic ability in organic transformations.
Article
Chemistry, Multidisciplinary
Yiqun Zhou, Shengjie Jiang, Xin Xu
Summary: In this study, a series of cationic rare-earth aryloxide complexes were prepared and applied to the Lewis pair polymerization of methyl methacrylate. The stereoregularity of the resulting polymer was found to be influenced by the R substituent, while the steric hindrance of the Ar and Ar' groups had no effect on the tacticity of the polymer, presumably due to their outward positioning in the cyclic intermediates. Kinetics studies revealed that the polymerization was a first-order process, and end group analysis indicated the presence of competing chain-termination side reactions.
CHINESE JOURNAL OF CHEMISTRY
(2021)
Article
Chemistry, Applied
Mengmeng Zhao, Xianhui Zhang, Ledong Wang, Liang Wang, Guangqian Zhu, Qinggang Wang
Summary: A series of iron(II) dichloride complexes (Fe1-Fe3) and iron(II) acetylacetonate complex (Fe4) bearing different oxazoline ligands were synthesized and showed excellent activity towards isoprene polymerization. The ligand environment and counter anion on iron center displayed significant effects on polymerization activity and selectivity. The possible polymerization mechanism was proposed.
APPLIED ORGANOMETALLIC CHEMISTRY
(2022)
Article
Chemistry, Inorganic & Nuclear
Daniel Auweiler, Marc Schnierle, Valentin Rapp, Mark R. Ringenberg
Summary: The coordination reaction of 1,1'-bis(diphenylphosphino)cobaltocenium (dppc)(+) with dicarbonylnickel(0) or cyclopentadienylnickel(II) was studied using experimental and spectroscopic analysis. The results confirmed the ligand-based reductions and revealed the interaction between the ligand and metal through electrochemistry and spectroscopy.
DALTON TRANSACTIONS
(2022)
Article
Chemistry, Multidisciplinary
Zeming Huang, Shaowu Wang, Xiancui Zhu, Yun Wei, Qingbing Yuan, Shuangliu Zhou, Xiaolong Mu, Hua Wang
Summary: In this study, a novel indolyl-based NCN pincer ligand precursor HL was designed and synthesized successfully, leading to various rare-earth metal chlorides and mixed complexes. The complexes were fully characterized and their structures determined, with further characterization using NMR spectroscopy for specific complexes. The research demonstrated that factors such as central metal ions and borates have influences on the catalytic activity and regio- and stereoselectivity for the polymerization of isoprene.
CHINESE JOURNAL OF CHEMISTRY
(2021)
Article
Chemistry, Inorganic & Nuclear
Nuria Portoles-Gil, Oriol Vallcorba, Concepcion Domingo, Ana Lopez-Periago, Jose A. Ayllon
Summary: The flexible N,N'-ditopic ligand 1,4-bis(4-pyridylmethyl)benzene (bpymb) combined with zinc(II) acetate (ZnAc) produces a two-dimensional coordination polymer with a layered structure, expanding the family of compounds involving zinc acetate and ditopic N,N'- ligands. The newly obtained coordination polymer was structurally characterized by single crystal XRD and exhibited increased photoluminescence properties compared to the free bpymb ligand.
INORGANICA CHIMICA ACTA
(2021)
Article
Chemistry, Inorganic & Nuclear
Yutong Han, Zhaohe Liu, Zhongfu Zhao, Bo Liu, Dongmei Cui
Summary: A series of constrained-geometry-configuration rare-earth metal complexes have been synthesized and shown high activity in polymerization reactions. The structures and properties of these complexes provide a basis for further exploration and application of rare-earth metal complexes.
Article
Engineering, Environmental
Xiaoyu Meng, Hongbo Zhao, Yu Zhao, Li Shen, Guohua Gu, Guanzhou Qiu
Summary: A new three-step precipitation process is proposed to efficiently recover rare earth-citrate (RE-Cit) complexes from (bio)leaching lixivium. This technology shows promise in the industrial application of rare earth (bio) hydrometallurgy and wastewater treatment due to its advantages of high efficiency, low cost, environmental friendliness, and simple operation.
Article
Chemistry, Inorganic & Nuclear
Tomas Chlupaty, Kristyna Brichova, Maksim A. Samsonov, Zdenka Ruzickova, Ales Ruzicka
Summary: In this study, a series of heteroleptic amidotin(II) amidinates and tin(II) bis(benzamidinate) compounds were synthesized, and the reversibility of some reactions was demonstrated through NMR study and DFT description.
DALTON TRANSACTIONS
(2022)
Article
Chemistry, Inorganic & Nuclear
Jiayu Yan, Shuangliu Zhou, Yukun Wei, Qian Liu, Donghan Wang, Lijun Zhang, Qingbing Yuan, Shaowu Wang
Summary: The double deprotonation of 2-aminomethyl pyridine by rare-earth metal triamido complexes is an alternative strategy to anchor dianionic iminopyridine on rare-earth metal centers. Oxygen or sulfur coordination promotes the double deprotonation of 2-aminomethyl pyridine and leads to the formation of new dianionic iminopyridine rare-earth metal complexes.
Article
Biochemical Research Methods
Hideaki Ishii, Mariko Shibuya, Yat-Ming So, Jenny K. Y. Wong, Emmie N. M. Ho, Kanichi Kusano, Yu Sone, Takahiro Kamiya, Ai Wakuno, Hideki Ito, Kenji Miyata, Masayuki Yamada, Gary Ngai-Wa Leung
Summary: A long-term longitudinal analysis of IOX4 in horse hair showed that the substance could be detected in horse hair up to 6 months postadministration, with no metabolites detected. The study also found individual variation in the distribution of IOX4 in the hair shaft over 6 months, with a significant diffusion of IOX4 observed in the postadministration hair samples.
DRUG TESTING AND ANALYSIS
(2022)
Article
Biochemical Research Methods
Hideaki Ishii, Mariko Shibuya, Yat-Ming So, Jenny K. Y. Wong, Emmie N. M. Ho, Kanichi Kusano, Yu Sone, Takahiro Kamiya, Ai Wakuno, Hideki Ito, Kenji Miyata, Masayuki Yamada, Gary Ngai-Wa Leung
Summary: IOX4, a HIF-PHD inhibitor, has hematopoietic effects for the treatment of anemia. Metabolic study in horses showed various metabolites of IOX4 in plasma and urine, as well as their corresponding detection times.
DRUG TESTING AND ANALYSIS
(2022)
Article
Chemistry, Inorganic & Nuclear
Fen You, Suting Xu, Jixing Wang, Jingjing Zhai, Fei Wang, Li Pan, Yat-Ming So, Xiaochao Shi
Summary: A simple method for accessing new derivatizable bulky-demanding OHF ligands has been developed, leading to the synthesis of a series of half-sandwich rare-earth metal complexes bearing the OHF ancillary ligands, which exhibit high catalytic activity for styrene (co)polymerization.
INORGANIC CHEMISTRY
(2022)
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
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
Biochemical Research Methods
Yat-Ming So, Jenny K. Y. Wong, April S. Y. Wong, Alice T. L. Tse, Terence S. M. Wan, Emmie N. M. Ho
Summary: The peptide EMP1-linear, found in white crystalline powder allegedly used for doping racehorses, can cyclize into EMP1, a well-known erythropoiesis stimulating agent. An in vitro metabolic study using horse liver S9 fraction revealed the presence of four metabolites of EMP1-linear, while an intravenous administration study in thoroughbred geldings showed the detection of EMP1 and the metabolites in postadministration plasma and urine samples. Among the metabolites, M3 had the longest detection time of up to 4 hours in plasma and 27 hours in urine, making it a potential target for controlling the misuse of EMP1-linear in equine sports.
DRUG TESTING AND ANALYSIS
(2023)
Article
Chemistry, Inorganic & Nuclear
Xue-Zhi Song, Tao Zhang, Yu-Hang Zhao, Jing-Chang Ni, Yu Pan, Zhenquan Tan, Xiao-Feng Wang
Summary: This study explores an efficient strategy to prepare metal phosphide materials with multiple interfaces, and by adjusting the cobalt-iron ratio and the rare-earth cerium content, the electrocatalytic activity of the reaction is regulated. Multicomponent heterostructure interface engineering can increase more exposed active sites, feasible charge transport, and strong interfacial electronic interaction.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Inorganic & Nuclear
Hoang-Long Pham, Thayalan Rajeshkumar, Lily Ueh-hsi Wang, Yat Hei Ng, Kai-Hong Wong, Yat-Ming So, Herman H. Y. Sung, Rolf Lortz, Ian D. Williams, Laurent Maron, Wa-Hung Leung
Summary: The steric and electronic effects on the stability and reactivity of cerium(IV) aryloxide complexes have been studied using the Kläui tripodal ligand [Co(eta(5)-C5H5){P(O)(OEt)(2)}(3)](-) (L-OEt(-)) as a support. Ce(IV) aryloxide complexes were synthesized using a Ce(IV) oxo species prepared in situ. The study found that the substituents of the aryloxide ligands did not significantly affect the Ce-O bond lengths and Ce-O-C angles.
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
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
Chemistry, Multidisciplinary
Tao Zhang, Yu-Lan Meng, Yu-Hang Zhao, Jing-Chang Ni, Yu Pan, Yan Dai, Zhenquan Tan, Xiao-Feng Wang, Xue-Zhi Song
Summary: The addition of an extra metal source leads to the transformation from crystalline alpha-Ni(OH)(2) to an amorphous NiCoFeCrMo-based high-entropy hydroxide (HEH), increasing the content of high-valence Ni3+ in HEH. For OER electrocatalysis, the quinary HEH exhibits a lower overpotential, a smaller Tafel slope, and enhanced intrinsic activity compared to other subsystems.
CHEMICAL COMMUNICATIONS
(2022)