Article
Chemistry, Multidisciplinary
Aleksandra Kieliszek, Maura Malinska
Summary: The study of the conformations of p-tert-butylcalix[8]-arene (TBC8) revealed the significant influence of different crystallization solvents on crystal structure and molecular conformations, with different conformations observed under different solvent conditions. Density functional theory calculations supported the experimental results, confirming the existence of different conformations under varying solvent conditions.
CRYSTAL GROWTH & DESIGN
(2021)
Article
Chemistry, Inorganic & Nuclear
Stephen Sproules
Summary: Spectroscopic and computational examination reveals a Class III mixed-valent ground state for the neutral tris-dioxolene complex [V(dbcat)(3)]. The radical is stabilized by delocalization across the ligands mediated by the V(v) center's energy matched d orbital manifold. This electronic structure differs from the tris-dithiolene and tris-diimine analogues with V(iv) and V(ii) ions, respectively.
DALTON TRANSACTIONS
(2022)
Article
Chemistry, Organic
Shaocong Shen, Zhijian Zong, Nan Sun, Baoxiang Hu, Zhenlu Shen, Xinquan Hu, Liqun Jin
Summary: A well-defined geometry-constrained tridentate NNN-cobalt complex was developed for regio- and stereoselective hydrosilylation of 1,3-diynes, tolerating a wide range of symmetrical and unsymmetrical substrates. The scale-up reaction demonstrated the practicality and efficiency of the developed strategy for the synthesis of diverse 1,3-enynylsilanes.
ORGANIC CHEMISTRY FRONTIERS
(2021)
Review
Chemistry, Multidisciplinary
Zhaona Liu, Bing Li, Leqian Song, Huacheng Zhang
Summary: Hybrid macrocyclic hosts containing rigid pillar[n]arene and flexible calix[m]arene were designed and prepared to reserve planar chirality, enhance molecular recognition, and build advanced self-assemblies. Different synthetic strategies were summarized and discussed for constructing hybrid macrocyclic structures. These structures exhibited interesting applications in molecular recognition, self-assembly, and catalysis.
Article
Multidisciplinary Sciences
Joanna Drzezdzon, Celina Mokwa, Artur Sikorski, Patrycja Parnicka, Adriana Zaleska-Medynska, Jacek Malinowski, Magdalena Kwiatkowska, Barbara Gawdzik, Dagmara Jacewicz
Summary: Nowadays, there are studies on the design and synthesis of new catalysts for olefin oligomerization and polymerization, with non-toxic metals and high catalytic activities. Transition metal complex compounds, such as Fe(II), Cr(III), and Zr(II), that contain pyridine or quinoline ligands have been found to exhibit moderate catalytic activity in ethylene and propylene polymerizations. In this study, a new cobalt(II) complex compound with bis(5-chloroquinolin-8-olato)-bis(pyridine) ligands was synthesized and tested for its catalytic activity in reactions of 2-chloro-2-propen-1-ol and norbornene oligomerizations. The results showed that the activated bis(5-chloroquinolin-8-olato)-bis(pyridine)-cobalt(II) catalyst can promote the formation of oligomers in nitrogen atmosphere, at atmospheric pressure, and at room temperature, demonstrating moderate catalytic activity in norbornene oligomerization and low catalytic activity in 2-chloro-2-propen-1-ol oligomerization.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Inorganic & Nuclear
Xiong Sun, Jinghang Shen, Thayalan Rajeshkumar, Laurent Maron, Congqing Zhu
Summary: Ligands play a crucial role in the formation of metal-metal bonds. This study reports a series of complexes with cerium-transition-metal bonds, which demonstrate various bonding interactions between cerium and transition metals.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Ana Karina Seguin, Carlos Cruz, Katherine Villafuerte, Dayan Paez-Hernandez, Diego Venegas-Yazigi, Veronica Paredes-Garcia
Summary: Two new coordination polymers (1 and 2) with a one-dimensional helical chain arrangement were synthesized. Compound 1 exhibited weak intrachain antiferromagnetic interaction, while compound 2 showed weak ferromagnetic interaction. Theoretical calculations confirmed the weak intrachain coupling in both compounds, with the dominance of zero-field splitting (ZFS) phenomenon at lower temperatures. A positive value of ZFS, with a major spin-orbit coupling component, was obtained.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Chemistry, Multidisciplinary
Tim Glasel, Benedikt N. Baumann, Marko Hapke
Summary: Cobalt complexes serve as catalysts in cycloaddition reactions, playing a crucial role in synthetic chemistry. By modifying precatalysts and developing novel cobalt catalysts, the conversion of new substrates and reaction modes can be achieved.
Article
Chemistry, Inorganic & Nuclear
Minhye Kim, Mirae Ok, Chenxing Li, Kayeong Go, Sehee Kim, Juyeong Kim, Jong Hwa Jung, Sung Ho Jung
Summary: The study focused on the synthesis and characterization of bis[terpyridine-based Pt(ii)] complexes with different terminal ligands. It was found that the choice of ligands resulted in different supramolecular architectures, including circular and helical fiber structures. The formation of supramolecular architectures was driven by PtMIDLINE HORIZONTAL ELLIPSISPtpi-pi and intermolecular hydrogen-bonding interactions. Additionally, the presence of pyridine led to a transition from circular to helical fiber structures.
INORGANIC CHEMISTRY FRONTIERS
(2023)
Article
Chemistry, Multidisciplinary
Luke J. Williams, Yunas Bhonoah, James W. Walton
Summary: A series of complexes with the general formula [(eta(6)-arene)RuCp][PF6] were synthesized, and the reactivity of the arene ring towards intermolecular nucleophilic aromatic substitution (SNAr) reaction with cyclic 1,3-diones was studied. Competition experiments revealed the leaving group ability of the aryl halides and nitroarenes, with the order of F >> NO2 > Cl > Br. Rapid photolysis reaction freed the arene rings quantitatively after SNAr reaction (<15 min).
CHEMICAL COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Hanna Stachowiak-Dluzynska, Krzysztof Kucinski, Bozena Wyrzykiewicz, Rhett Kempe, Grzegorz Hreczycho
Summary: Vinylsilanes are versatile chemical derivatives that are increasingly being used in various synthetic transformations. In this study, a novel cobalt-catalyzed procedure was developed for the selective hydrosilylation of internal aryl-, alkyl-, and silylalkynes. The use of cobalt complexes with triazine-based PNP pincer-type ligands enabled the exclusive syn-addition of primary and secondary silanes to C=C bonds, resulting in the efficient formation of (E)-silylalkenes and vicinal disilylalkenes with excellent stereoselectivity and regioselectivity. Unlike other transition metal-catalyzed procedures, no external additives were required as hydrosilanes served as both substrates and activators.
Article
Chemistry, Inorganic & Nuclear
Feng Yuan, Xiaohua Liu, Lifeng Tan
Summary: In this study, two arene Ru(?) complexes, Ru1 and Ru2, were synthesized and characterized for their binding properties with the RNA triplex poly(U)center dot poly(A)?poly(U). The results showed that both Ru1 and Ru2 bind to the RNA in an intercalation mode. However, Ru2 exhibited a significantly stronger binding affinity compared to Ru1. Additionally, thermal denaturation studies revealed that Ru1 selectively stabilized the Hoogsteen base-paired strand, while Ru2 could stabilize both the template duplex and the third-strand, with a stronger effect on the third-strand. This study provides the first example of arene metal complexes interacting with triple-helical nucleic acids.
INORGANICA CHIMICA ACTA
(2022)
Article
Chemistry, Multidisciplinary
Zhaoyang Cheng, Jun Guo, Yufeng Sun, Yushan Zheng, Zhehong Zhou, Zhan Lu
Summary: This study presents a controllable cobalt-catalyzed sequential hydrosilylation/hydroboration reaction of arylacetylenes, achieving high regioselectivities for all possible regio-outcomes. Adjusting the ligands of cobalt catalysts combined with dual catalysis relay strategy is crucial for achieving regio-chemistry control, which may inspire further exploration in diversity-oriented synthesis involving multiple additions.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Inorganic & Nuclear
Meaghan M. Deegan, Rameswar Bhattacharjee, Stavros Caratzoulas, Eric D. Bloch
Summary: This study presents novel approaches to preparing porous molecular structures by metalating nonporous organic cages, resulting in materials with significant structural rigidity. The hybrid metal-organic cages obtained through this method combine characteristics of both porous organic cages and porous coordination cages, potentially offering a new direction for designing and developing porous molecular materials with tunability in various properties.
INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Organic
Jian Rong, Yidan Wu, Xiaoheng Ji, Tingting Zhao, Bangshao Yin, Yutao Rao, Mingbo Zhou, Atsuhiro Osuka, Ling Xu, Jianxin Song
Summary: In the presence of AlCl3, the reaction between meso-formyl Ni(II) porphyrin 1 and zirconacyclopentadiene 2 yielded four products 3, 4, 5, and 6 with a total yield of over 85%. The structures of these compounds were well-characterized, and the mechanism of their formation was proposed based on isotopic labeling experiments, suggesting the involvement of a Friedel-Crafts-type reaction and beta-H shift.
