Article
Chemistry, Inorganic & Nuclear
Shweta Sagar, Kulsum Bano, Alok Sarkar, Kuntal Pal, Tarun K. Panda
Summary: A novel sulfur-supported magnesium complex was developed as a catalyst for ring-opening polymerization of rac-lactide and epsilon-caprolactone. This catalyst showed high selectivity for rac-lactide polymerization, resulting in isoselective PLA with a P-i value of 0.77. The polymerization proceeded under mild reaction conditions without the need for an external initiator, and the resulting polyesters exhibited good control over the molecular weight.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2022)
Article
Biochemistry & Molecular Biology
Maxim V. V. Zabalov, Badma N. N. Mankaev, Mikhail P. P. Egorov, Sergey S. S. Karlov
Summary: Density functional theory simulations were conducted to investigate the ring-opening copolymerization of epsilon-caprolactone and L-lactide using a novel gallium complex with an aminobis(phenolate) ligand. The results show that the copolymerization with this catalyst exhibits a faster polymerization rate for epsilon-caprolactone than for L-lactide, suggesting the formation of a predominantly block copolymer composed of epsilon-caprolactone and L-lactide.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Polymer Science
Monique J. Leite, Tamara Agner, Fabricio Machado, Brenno A. D. Neto, Pedro H. H. Araujo, Claudia Sayer
Summary: This study utilized an iron-containing imidazolium-based ionic liquid as a catalyst to efficiently catalyze the ring-opening polymerization of epsilon-caprolactone under mild reaction conditions, resulting in the synthesis of polycaprolactones with high yields and narrow molecular weight distributions.
JOURNAL OF POLYMER RESEARCH
(2022)
Review
Chemistry, Inorganic & Nuclear
Ling-Jo Wu, Wei Lee, Prasanna Kumar Ganta, Yu-Lun Chang, Yung -Chi Chang, Hsuan-Ying Chen
Summary: Multinuclear metal complexes can enhance the catalytic activity of ROP catalysts, but the distance between catalytic metal centers and the resonance of ligands play important roles in the catalytic reaction. This review focuses on recent studies of multinuclear metal catalysts in ROP and compares their catalytic activity with mononuclear metal catalysts.
COORDINATION CHEMISTRY REVIEWS
(2023)
Article
Polymer Science
Yutthana Wongnongwa, Setsiri Haesuwannakij, Kwanchanok Udomsasporn, Phongnarin Chumsaeng, Anucha Watcharapasorn, Khamphee Phomphrai, Siriporn Jungsuttiwong
Summary: Polymerization of biodegradable lactide and lactone has been extensively investigated. Density functional theory calculations were used to study the initiation and first propagation for ring-opening polymerization mechanisms of L-lactide (LA) and e-caprolactone (CL) on aluminum complexes. The results showed that the ROP mechanisms of LA and CL on different catalysts were classified into homopolymerization and copolymerization. The understanding gained in this study could contribute to the development of high-performance catalysts for biodegradable lactide and lactone ROP reactions.
Article
Polymer Science
Yi Wan, Yun Bai, Hai Xu, Jianghua He, Yuetao Zhang
Summary: The study successfully synthesized five chiral binuclear aluminum methyl complexes, which catalyze the ring-opening polymerization of rac-lactide in a controlled manner and produce polymers with high isoselectivity. The kinetic studies show a first-order dependence on monomer concentration, supporting an enantiomorphic site control mechanism for the catalysts. This strategy can also be applied to other lactones for ring-opening polymerization.
MACROMOLECULAR RAPID COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Hai-Bo Wu, Xian-Tai Zhou, Xiao-Wu Zhou, Yan-Xiong Fang
Summary: A feasible industrial method for poly(e-caprolactone) (PCL) preparation using benzoic acid as organocatalyst was developed. Benzoic acid was proved to efficiently catalyze the ring-opening polymerization of e-caprolactone (e-CL) under mild conditions. The conversion of e-CL to PCL reached 84.7% under optimized reaction conditions, with a number-average molecular weight (Mn) of 7700 g/mol and dispersity (PDI) of 1.25. Additionally, a monomer-activated ring-opening polymerization mechanism mediated by benzoic acid was proposed.
Article
Polymer Science
Chun-Juei Chang, Wei Lee, Yu-Chi Liou, Yu-Lun Chang, Yi-Chun Lai, Shangwu Ding, Hsuan-Ying Chen, Hsing-Yin Chen, Yung-Chi Chang
Summary: The study demonstrated that dinuclear aluminum complexes exhibited higher catalytic activity than mononuclear aluminum complexes, particularly those with 1,3-substituted phenyl ligands. One Al atom in the dinuclear Al system acted as an electron-withdrawing group, influencing the other Al atom through associated aromatic ligands, thereby enhancing catalytic activity for the ROP of CL.
EUROPEAN POLYMER JOURNAL
(2022)
Article
Biochemistry & Molecular Biology
Ahmed Abd El-Fattah, Elizabeth Grillo Fernandes, Federica Chiellini, Emo Chiellini
Summary: Amphiphilic copolymers with interesting architecture and tunable properties are promising materials for biomedical applications. Enzymatic catalysis provides a suitable alternative for the preparation of these materials without the use of toxic catalysts. The structure-property relationship of copolymers was studied by varying the molecular weight of Pluronic (EPE) and the molar ratios between ε-caprolactone monomer and EPE macro-initiator (M/In). The obtained copolymers were chemically characterized and their morphologies evaluated. The results showed a correlation between the differential scanning calorimetry data and X-ray diffraction data, suggesting the importance of the central block length in crystal formation. Preliminary cytotoxicity experiments confirmed the non-toxic nature of the copolymers.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Chemistry, Inorganic & Nuclear
Eduard Gloeckler, Swarup Ghosh, Christoph Woelper, Deniz Coban, Andre H. Groeschel, Stephan Schulz
Summary: Compared to linear and branched polyesters, the exploration of cyclic polyesters has been limited. In this study, ketodiiminate magnesium complexes were synthesized and used as catalysts for the synthesis of cyclic polylactide and cyclic polycaprolactone under mild reaction conditions. Catalyst 2 exhibited excellent reactivity and selectivity.
Article
Polymer Science
Martin Castillo-Santillan, Jose Roman Torres-Lubian, Antonio Martinez-Richa, Silvia T. Huerta-Marcial, Maria C. Gutierrez, Katja Loos, Maria Guadalupe Perez-Garcia, Josue D. Mota-Morales
Summary: This work provides new insights into the ring-opening polymerization of L-lactide and e-caprolactone, leading to the synthesis of polymer blends and a block copolymer. The selection of parameters and catalysts allows for the production of polyesters with tunable properties and controlled degradation profiles.
Article
Chemistry, Multidisciplinary
Begum Canan Yildiz, Asgar Kayan
Summary: Titanium (IV) silyliminophenolate complexes were synthesized and shown to be active catalysts for the ring-opening polymerization of epsilon-caprolactone and L-lactide. The structures of compounds were elucidated using spectroscopic and thermal analysis methods, and resulting polymers were characterized using gel permeation chromatography.
SUSTAINABLE CHEMISTRY AND PHARMACY
(2021)
Article
Chemistry, Physical
Somboon Chaemchuen, Qingping Dai, Jichao Wang, Chenyang Zhu, Nikom Klomkliang, Ye Yuan, Chen Cheng, Mirella Elkadi, Zhixiong Luo, Francis Verpoort
Summary: A series of catalysts with a sodalite structure were explored for the polymerization of L-lactide into biodegradable polylactides, showing that the metals in the catalyst structure had significant impact on catalytic activities and properties of polymer products. The best performing catalyst showed potential as a heterogeneous catalyst, being able to be reused multiple times without significant loss of catalytic activity.
APPLIED CATALYSIS A-GENERAL
(2021)
Article
Polymer Science
L. Kannammal, B. Meeenarathi, V Parthasarathy, R. Anbarasan
Summary: The Mn2+ and Mo6+ based metal-mercaptoacetate hybrids were successfully synthesized using a simple acid-base titration method, and characterized by various analytical techniques. The hybrids were found to exhibit catalytic activity towards the ring-opening polymerization of epsilon-caprolactone, leading to an increase in the molecular weight of the product.
Article
Chemistry, Physical
Sami Gesslbauer, George Hutchinson, Andrew J. P. White, Jordi Bures, Charles Romain
Summary: The research demonstrates that the activity of chiral-at-metal aluminum complexes in cyclic ester ring-opening polymerization is influenced by the alkoxide bulkiness and complex chirality. Experimental results show that using enantiopure catalysts can achieve better results than using a mixture of racemic catalysts.
Article
Chemistry, Inorganic & Nuclear
Vaibhav Bedi, Dipendu Mandal, Zahid Hussain, Shi-Ming Chen, Yile Wu, Zheng-Wang Qu, Stefan Grimme, Douglas W. Stephan
Summary: The reaction of (tBuO(2)CN)(2) with 9-BBN leads to the formation of a bicyclic heterocyclic compound, while its reactions with BF3 or [Et3Si][B(C6F5)(4)] result in the isolation of different compounds. Computational studies reveal that the steric and electronic properties of the Lewis acid are important in the formation of one of the compounds.
DALTON TRANSACTIONS
(2024)
Article
Chemistry, Inorganic & Nuclear
Chisa Itoh, Haruka Yoshino, Taku Kitayama, Wataru Kosaka, Hitoshi Miyasaka
Summary: A new synthetic route for constructing functional paddlewheel diruthenium(II,II) complexes was developed, utilizing Schiff base condensation reactions. The attached Schiff base groups significantly affected the electronic states of the resulting complexes, as revealed by cyclic voltammetry and DFT calculations.
DALTON TRANSACTIONS
(2024)
Article
Chemistry, Inorganic & Nuclear
Danrui Ni, Haozhe Wang, Xianghan Xu, Weiwei Xie, Robert J. Cava
Summary: A layered rhombohedral polymorph of indium(iii) triiodide is synthesized at high pressure and temperature. It has an orange color, which is different from ambient pressure InI3, which has a monoclinic molecular structure and a light-yellow color.
DALTON TRANSACTIONS
(2024)
Review
Chemistry, Inorganic & Nuclear
Juan Carlos Perez-Sanchez, Raquel P. Herrera, M. Concepcion Gimeno
Summary: Gold(II) complexes have been less utilized in catalysis compared to their gold(I) and gold(III) counterparts. However, gold(II) complexes offer potential in homo-coupling and cross-coupling reactions, as they are more easily accessible through simplified oxidation and reduction processes. Gold(II) exhibits characteristics of both soft acid gold(I) and hard acid gold(III). This review explores the unique reactivity and potential applications of gold(II) species, highlighting their significance in catalytic transformations.
DALTON TRANSACTIONS
(2024)
Article
Chemistry, Inorganic & Nuclear
Nighat Yousuf, Yanping Ma, Qaiser Mahmood, Wenjuan Zhang, Yizhou Wang, Hassan Saeed, Wen-Hua Sun
Summary: In this study, a series of structurally rigid cyclooctyl-fused iminopyridine iron complexes were synthesized and used with methylaluminoxane for isoprene polymerization. The extent of steric hindrance of the ligand framework was found to significantly affect catalytic performance, with less hindrance leading to better activity and stability.
DALTON TRANSACTIONS
(2024)
Article
Chemistry, Inorganic & Nuclear
Chenghao Song, Huiwei Du, Menglei Xu, Jie Yang, Xinyu Zhang, Jungan Wang, Yuanfang Zhang, Chengjun Gu, Rui Li, Tao Hong, Jingji Zhang, Jiangying Wang, Yongchun Ye
Summary: This study improves the performance of perovskite solar cells by using a dual-hole transport layer strategy. This strategy enhances the charge transfer efficiency of the transport layer, reduces charge recombination, and improves the quality of the perovskite film layer. Ultimately, the stability of the device is enhanced.
DALTON TRANSACTIONS
(2024)
Article
Chemistry, Inorganic & Nuclear
Mahender Singh, Aakash Yadav, Ranjit Singh, Chullikkattil P. Pradeep
Summary: A new aryl selenonium polyoxometalate hybrid was developed and compared with an aryl sulfonium polyoxometalate hybrid in terms of their photocatalytic properties. It was found that the aryl selenonium hybrid exhibited better catalytic performance, which could be attributed to the larger atomic radii of selenium stabilizing the photogenerated electron-hole pair more efficiently. Additionally, the generation of elemental selenium through cleavage of C-Se bonds during catalysis was observed.
DALTON TRANSACTIONS
(2024)
Article
Chemistry, Inorganic & Nuclear
Yuhan Xie, Boyu Dong, Xuemin Wang, Siyuan Wang, Jinxi Chen, Yongbing Lou
Summary: This study successfully fabricated visible-light-responsive three-dimensional core-shell CoSe2/ZnIn2S4 heterostructures and achieved attractive activity in photocatalytic hydrogen evolution. The presence of CoSe2 improved light absorption and accelerated charge transfer kinetics. The strong interaction between CoSe2 and ZnIn2S4 reduced charge recombination, further enhancing photocatalytic activity for hydrogen evolution.
DALTON TRANSACTIONS
(2024)
Article
Chemistry, Inorganic & Nuclear
Andre L. de O. Batista, Joao Marcos T. Palheta, Mauricio J. Piotrowski, Celso R. C. Rego, Diego Guedes-Sobrinho, Alexandre C. Dias
Summary: This study presents a simulation protocol that provides a solid foundation for exploring two-dimensional materials. Using the TiBr2 2H monolayer as an example, the study reveals its promising properties for optoelectronic and valleytronic applications, including its stability, spin-orbit coupling effects, and optical helicity selection rule.
DALTON TRANSACTIONS
(2024)
Article
Chemistry, Inorganic & Nuclear
Jiang Jiang, Zi-Wei Li, Zhi-Zhuan Zhang, Bin Tan, Zhao-Feng Wu, Xiao-Ying Huang
Summary: In this work, two metal organic frameworks (MOFs) containing {Cu2I2} clusters, Eu-CuI-INA and Sr-K-CuI-INA, were synthesized and characterized. Both materials have a three-dimensional structure with {Cu2I2} clusters coordinated by INA(-) ligands and Eu3+ or Sr2+ ions. The Sr-K-CuI-INA material exhibited sensitive fluorescence sensing behaviors towards cysteine and nitro-bearing molecules, showing potential applications in bio and explosive molecule sensing. This work provides a good reference for designing fluorescent MOF probes containing CuI molecules.
DALTON TRANSACTIONS
(2024)
Article
Chemistry, Inorganic & Nuclear
Zhiya Lin, Jiasheng Wu, Qianwen Ye, Yulong Chen, Hai Jia, Xiaohui Huang, Shaoming Ying
Summary: Na-ion batteries (NIBs) have attracted great interest as a potential technology for grid-scale energy storage due to the wide distribution, low cost, and environmental friendliness of sodium resources. However, their implementation is hindered by low rate capability and cycling stability caused by the large ionic size of Na+. In this study, a three-dimensional nanoarchitectured coral-like CoSe2@N-doped carbon (CL-CoSe2@NC) was synthesized, and it exhibited improved sodium storage properties with better electrode kinetics and a stable SEI film.
DALTON TRANSACTIONS
(2024)
Article
Chemistry, Inorganic & Nuclear
Ya-Qiong Zhang, Yu Zhang, Guoping Zeng, Rong-Zhen Liao, Man Li
Summary: The mechanism and selectivity of CO2 reduction under visible light were investigated using density functional calculations. The results showed that a tetradentate PNNP-type Iridium(III) complex exhibited high activity and selectivity in the reaction.
DALTON TRANSACTIONS
(2024)
Article
Chemistry, Inorganic & Nuclear
Sanyukta Ghosh, Shubhanth Jain, Soumya Ranjan Mishra, Gerda Rogl, Peter Rogl, Ernst Bauer, B. S. Murty, A. Govindaraj, Ramesh Chandra Mallik
Summary: In this study, reduced graphene oxide (rGO) was uniformly dispersed in the In0.5Co4Sb12 bulk material by ultrasonication, which effectively reduced the lattice thermal conductivity and improved the thermoelectric efficiency.
DALTON TRANSACTIONS
(2024)
Article
Chemistry, Inorganic & Nuclear
Mika Takeuchi, Yutaka Amao
Summary: This study developed an effective visible-light driven system for fumaric acid production using renewable resources such as biomass derivatives, providing an alternative to the current petroleum-based synthesis methods.
DALTON TRANSACTIONS
(2024)
Article
Chemistry, Inorganic & Nuclear
Juan Jian, Meiting Wang, Zhuo Wang, Jingwen Meng, Yuqin Yang, Limin Chang
Summary: Developing low-cost and self-supported bifunctional catalysts is crucial for highly efficient water splitting devices. In this study, nano-NiFe2O4 was directly grown onto iron foil surface and Sn4+ was introduced into the NiFe2O4. The resulting Sn-NiFe2O4/IF showed low overpotentials and high current densities during oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), making it a promising catalyst for large-scale hydrogen production.
DALTON TRANSACTIONS
(2024)