Article
Chemistry, Inorganic & Nuclear
Mirko Rippke, Hans-Joachim Drexler, Torsten Beweries
Summary: Coordination of a pyridine-pyrazole-based PNN(H) ligand to RhI produces a family of neutral and cationic RhI complexes. These complexes show activity for the dehydrocoupling of amine boranes, producing cyclic oligomers as the main product. The neutral complexes exhibit higher activity in catalyst systems with base activation.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2023)
Article
Food Science & Technology
Manpreet Kaur Grewal, Todor Vasiljevic, Thom Huppertz
Summary: The addition of Ca and Mg increased beta-sheet structures and decreased triple helices and turns in both individual and binary mixtures of caseins, indicating binding of cations to similar sites. Ca had stronger affinity for caseins and reduced electrostatic repulsion, leading to an increase in hydrophobic interactions and beta-sheet structures.
INTERNATIONAL DAIRY JOURNAL
(2021)
Article
Materials Science, Ceramics
Boil Chen, Meihua Wu, Qiyun Liu, Can He, Yifan Yang, Xinjian Ye, Chaochao Gao, Zhaohui Huang, Xin Min, Xiaohong Zheng, Tianyi Tao
Summary: In this research, tetragonal zirconia (t-ZrO2) was synthesized using a one-step high-temperature solid-state sintering technique with magnesite, dolomite, and limestone as stabilizers and zircon as the raw material. The most suitable stabilizers and reaction conditions were determined, and the stabilization mechanism of zirconia structure was explored. The findings have important reference value for reducing the cost of the synthetic t-ZrO2 process.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Multidisciplinary
David Decker, Hans-Joachim Drexler, Wolfgang Baumann, Fabian Reiss, Torsten Beweries
Summary: In this study, the synthesis and characterization of two iridium pincer monocarbonyl complexes with Yamashita's PBP boryl ligand are reported. These complexes were tested as precatalysts for the catalytic dehydrocoupling of amine boranes, and one of them showed selective production of polyaminoboranes. A tetrahydride complex was also identified as the resting state of catalysis.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Geosciences, Multidisciplinary
Gaston Larrea, Nicolas Wyngaard, Mercedes Eyherabide, Nahuel Reussi Calvo, Marino Puricelli, Pablo Barbieri, Hernan Angelini, Fernando Salvagiotti, Hernan Sainz Rozas
Summary: This study aimed to determine the concentration and decrease rate of cationic nutrients (Cae, Mge, and Ke) in uncropped and continuously cropped soils, and evaluate the factors contributing to their depletion. The relative harvested area of soybean, magnesium concentration in 2011, and rainfall were found to be the main factors influencing the decrease in these nutrients. If the current depletion rates continue, nutrient deficiencies in main crops could become evident in the medium/short term.
Review
Multidisciplinary Sciences
R. Todd Alexander, Henrik Dimke
Summary: Calcium and magnesium, as the most abundant divalent cations in the body, are regulated by intestinal absorption, kidney reabsorption, and bone storage and exchange. The majority of filtered divalent cations are reabsorbed through paracellular pathways in the proximal tubule and thick ascending limb of the loop of Henle. Calcium is mostly reabsorbed in the proximal tubule, while magnesium is mostly reabsorbed in the thick ascending limb.
ANNALS OF THE NEW YORK ACADEMY OF SCIENCES
(2022)
Article
Nutrition & Dietetics
Ting-Ting Gong, Yi-Fan Wei, Xin-Yu Li, Fang-Hua Liu, Zhao-Yan Wen, Shi Yan, Xue Qin, Song Gao, Xiu-Qin Li, Yu-Hong Zhao, Qi-Jun Wu
Summary: This study found that pre-diagnostic consumption of calcium and magnesium was unrelated to ovarian cancer survival, while a higher calcium-to-magnesium intake ratio was strongly associated with worse survival among ovarian cancer patients.
EUROPEAN JOURNAL OF NUTRITION
(2022)
Article
Chemistry, Physical
Ashley P. Black, Carlos Frontera, Arturo Torres, Miguel Recio-Poo, Patrick Rozier, Juan D. Forero-Saboya, Francois Fauth, Esteban Urones-Garrote, M. Elena Arroyo-de Dompablo, M. Rosa Palacin
Summary: Ca2MnO3.5 and CaV2O4 were found to be promising positive electrode materials for calcium metal based high-energy density batteries. Experimental and research results reveal various characteristics and reaction mechanisms of these materials. For Ca2MnO3.5, electrochemical oxidation leads to the occurrence of F- intercalation, while CaV2O4 enables the electrochemical extraction of calcium ions and the formation of a solid solution.
ENERGY STORAGE MATERIALS
(2022)
Article
Water Resources
Mekuanint Lewoyehu, Dagnachew Fentahun, Solomon Addisu
Summary: Irrigation water quality is crucial for plant growth, crop production, and public health. This study evaluates the suitability of irrigation water in the Koga region of Ethiopia for crops intended for human consumption. The results indicate that the water samples do not meet the safe limits set by FAO, WHO, EU, and other nations, suggesting that consuming crops and vegetables without proper preparation is not recommended.
APPLIED WATER SCIENCE
(2023)
Article
Engineering, Environmental
Pingli Jiang, Ruiqing Hou, Tao Chen, Lingchuang Bai, Jingan Li, Shijie Zhu, Liguo Wang, Regine Willumeit-Roemer, Shaokang Guan
Summary: Novel calcium carbonate (CaCO3) coatings were prepared via the hydrothermal method and optimized with the addition of glutamate acid (Glu) or dopamine (DOPA) to improve the degradation and biological performance of MgZnCa alloy.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Inorganic & Nuclear
Sohail H. Dar, Pattath D. Pancharatna, Musiri M. Balakrishnarajan
Summary: Polyhedral boron clusters are highly stable and hard borides that form interconnected periodic networks. The electronic delocalization across these clusters has a significant impact on their stability and structure. Understanding the nature of electronic communication between polyhedra in polyhedral borides is crucial for designing advanced materials with desired properties.
INORGANIC CHEMISTRY
(2023)
Article
Immunology
Luca T. Giurgea, Jae-Keun Park, Kathie-Anne Walters, Kelsey Scherler, Adriana Cervantes-Medina, Ashley Freeman, Luz Angela Rosas, John C. Kash, Jeffery K. Taubenberger, Matthew J. Memoli
Summary: The study found that the stability and activity of recombinant N1/N2 NA vaccine (NAV) did not directly correlate with immunogenicity and efficacy, as reassessed through immunization and viral challenge in mice. Mice vaccinated with NAV showed strong antibody responses against N1 and N2 and reduced viral titers and antiviral/inflammatory responses after influenza A (H1N1) virus challenge, underscoring the importance of NA in influenza vaccination strategies.
Article
Nutrition & Dietetics
Rebecca B. Costello, Andrea Rosanoff, Qi Dai, Leila G. Saldanha, Nancy A. Potischman
Summary: The balance between low magnesium intake and high calcium intake has been associated with increased risk of chronic diseases. A Ca:Mg ratio range of 1.70-2.60 is considered optimal, yet the average ratio for US adults exceeds 3.00. Some individuals may benefit from magnesium supplementation to maintain a favorable dietary Ca:Mg ratio.
ADVANCES IN NUTRITION
(2021)
Article
Plant Sciences
Reinhard W. Neugschwandtner, Jirina Szakova, Vera Pachtrog, Pavel Tlustos, Martin Kulhanek, Jindrich Cerny, Hans-Peter Kaul, Helmut Wagentristl, Gerhard Moitzi, Pia Euteneuer
Summary: The status of macronutrients phosphorus (P), potassium (K), sulphur (S), calcium (Ca) and magnesium (Mg) was assessed 15 years after the establishment of a long-term crop rotation and soil tillage trial. The results showed that different tillage methods did not affect the distribution of macronutrients in the soil, but crop rotation had a significant impact on the nutrient uptake of winter wheat.
Article
Plant Sciences
Meng Hu, Yuan Yang, Mingyang Fan, Kexin Huang, Lu Wang, Ting Lv, Xiangui Yi, Lin Chen, Yanming Fang
Summary: This study analyzed the concentration of calcium and magnesium in needles of two pine tree species in East China and explored their inter- and intra-population variation pattern and relationship with environmental factors. The results showed that elevation and individual differences were the strongest factors impacting calcium and magnesium variation. Element concentration was correlated with environmental factors such as longitude, latitude, elevation, and mean annual temperature. This research provides insights into tree growth, population survival, and forest succession.
Review
Chemistry, Multidisciplinary
Thangavel Vijayakanth, David J. Liptrot, Ehud Gazit, Ramamoorthy Boomishankar, Chris R. Bowen
Summary: This article comprehensively reviews the application of piezo- and ferro-electric materials based on organic molecules and organic-inorganic hybrids in mechanical energy harvesting. The article describes the characterization of the piezo- and ferroelectric properties of these materials and highlights the advantages they have over traditional materials. It also discusses the potential of peptide-based and other biomolecular materials as alternative options. The article concludes with an analysis of the current limitations and future prospects in this field of research.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Physical
Laura E. English, Matthew D. Jones, David J. Liptrot
Summary: An N-heterocyclic phosphine (NHP) has been investigated as a catalyst for transesterification reactions of commercial polymer samples, displaying high degradation activity towards poly(lactic acid) with methanol. However, attempts to depolymerise other polymers were unsuccessful, and NHP was found to form a new active catalyst under transesterification conditions.
Article
Chemistry, Multidisciplinary
Han-Ying Liu, Samuel E. Neale, Michael S. Hill, Mary F. Mahon, Claire L. McMullin, Emma Richards
Summary: Ionic compounds containing sodium cations are known for their stability and resistance to redox reactivity. However, when treated with non-reducible organic bases, a low oxidation state {Mg2Na2} species undergoes selective extrusion of sodium metal and oxidation of the Mg-I centers. Quantum chemical studies indicate that intramolecular electron transfer is facilitated by the molecular orbitals of the {Mg2Na2} ensemble.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Laura E. English, Thomas M. Horsley Downie, Catherine L. Lyall, Mary F. Mahon, Claire L. McMullin, Samuel E. Neale, Carla M. Saunders, David J. Liptrot
Summary: The (IPr)CuOtBu catalysed reduction of 11 aryl and alkyl isocyanates with pinacolborane resulted in the formation of boraformamides, pinBN(R)C(O)H, in most cases. Overreduction was observed only for electron poor aryl isocyanates (4-NC-C6H4NCO, 4-F3C-C6H4NCO, 3-O2N-C6H4NCO). Computational analysis revealed that the stability of [(IPr)CuH](2), proposed as the catalyst resting state, influences selectivity and offers a potential solution to prevent overreduction in future work. In the case of iPrNCO, the formation of [(IPr)CuH](2) prevents overreduction kinetically. However, for 4-NC-C6H4NCO, the barrier height for the first step of overreduction is much lower, resulting in unselective reduction.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Kyle G. G. Pearce, Michael S. S. Hill, Mary F. F. Mahon
Summary: Reaction of BeCl2 with dilithium diamide yields the dimeric chloroberyllate, leading to the formation of a 2-coordinate beryllium amide. Reduction of the beryllium amide using lithium or sodium in benzene produces relevant organoberyllate products, likely through transient Be(i) radicals.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Inorganic & Nuclear
Henry T. W. Shere, Michael S. Hill, Samuel E. Neale, Mary F. Mahon, Claire L. McMullin, Andrew S. S. Wilson
Summary: This article investigates the contrasting reactivities of molecular beta-diketiminato (BDI) calcium hydride and n-hexyl derivatives towards bis(pinacolato)diboron (B(2)pin(2)). The study finds that the dimeric calcium hydride forms an unusual diborane(6) dianion, while the initially dimeric organocalcium reagent converts to a calcium diboranate monomer. Attempts to induce heterolysis of the B-B bond in the calcium diboranate monomer were unsuccessful, resulting in either dismutation or the generation of N-donor adduct derivatives. These different reactivities can be explained by density functional theory (DFT) calculations, which attribute them to the larger radius and lower steric congestion of the third-row group 2 cation.
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
(2023)
Article
Chemistry, Inorganic & Nuclear
Dawid J. J. Babula, Rex S. C. Charman, Thomas H. H. Jerome, Thomas M. Horsley M. Downie, Mary F. F. Mahon, David J. J. Liptrot
Summary: Sigma-bond metathesis reactions between [(6-Dipp)CuOtBu] and three diboranes resulted in the synthesis of three new copper(I) boryl complexes [(6-Dipp)CuBcat], [(6-Dipp)CuBneop], and [(6-Dipp)CuBhex]. While [(6-Dipp)CuBcat] and [(6-Dipp)CuBneop] formed rapidly, heating was required to obtain [(6-Dipp)CuBhex]. Crystallographic analysis revealed that all three complexes were monomers with distorted-linear structures at the copper atom. [(6-Dipp)CuBneop] exhibited comparable stability to [(IPr*)Cu-Bneop], remaining stable in solution for days without decomposition. [(6-Dipp)CuBhex] represents a rare example of a crystallographically characterized complex containing a boryl anion supported by a hexylene glycolato ligand.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Rex S. C. Charman, Josie A. Hobson, Ross A. Jackson, Mary F. Mahon, Samuel E. Neale, David J. Liptrot
Summary: In this study, two acyclic boryl complexes, (6-Dipp)CuB(OMe)2 and (6-Dipp)CuB(OMe)NMe2, were synthesized and their similar reactivities were demonstrated.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Inorganic & Nuclear
Han-Ying Liu, Mary F. Mahon, Michael S. Hill
Summary: The potassium diamidoalumanyl reacts with pinacolato boron esters and B(OMe) to produce potassium (alkoxy)borylaluminate derivatives. The reactivity of these derivatives with heteroallene molecules highlights the kinetic inaccessibility of their Al-B bonds.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Kyle G. Pearce, Chiara Dinoi, Ryan J. Schwamm, Laurent Maron, Mary F. Mahon, Michael S. Hill
Summary: This study investigates the formation of a series of calcium complexes, in which the orientation and hapticity of the aryl units are influenced by the position of the methyl substituent and steric hindrance. Additionally, an unusual reaction mechanism involving the generation of an intermediate dicalcium species and the polyhapto engagement of the aryl substituents with calcium is observed.
Article
Chemistry, Multidisciplinary
Sylwia Ostrowska, Pierre Arnaut, David J. Liptrot, Catherine S. J. Cazin, Steven P. Nolan
Summary: The synthesis, isolation, and full characterization of a new copper complex [Cu(IPr)(OC(H)(CF3)(2))] (IPr = 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene) are reported. This copper(I) complex is a versatile synthon capable of activating various X-H bonds including C-H, N-H, and S-H bonds. [Cu(IPr)(OC(H)(CF3)(2))] was investigated as a pre-catalyst in several catalytic reactions.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Ross A. A. Jackson, Aidan J. R. Matthews, Petra Vasko, Mary F. F. Mahon, Jamie Hicks, David J. J. Liptrot
Summary: The potassium aluminyl complex K-2[Al{N(Dipp)SiMe3}(2)](2) was synthesized, representing the first example of an aluminyl anion supported by an acyclic ligand framework. Attempts to form the same structure with a larger ligand framework resulted in C-H cleavage. K-2[Al{N(Dipp)SiMe3}(2)](2) behaved as a nucleophilic source of aluminum, forming a monomeric, acyclic magnesium aluminyl complex when reacted with an electrophilic b-diketiminate supported magnesium(II) iodide.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Han-Ying Liu, Samuel E. Neale, Michael S. Hill, Mary F. Mahon, Claire L. McMullin, Benjamin L. Morrison
Summary: [{SiNDipp}MgNa](2) reacts directly with H-2 to form a heterobimetallic hydride. Computational density functional theory (DFT) studies suggest that this reactivity is initiated by orbitally-constrained sigma(Mg-Mg)-> sigma*(H-H) and sigma(H-H) -> n*(Na(3s)) interactions between the frontier MOs of both H-2 and the tetrametallic core of [{SiNDipp}MgNa](2).
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Han-Ying Liu, Samuel E. Neale, Michael S. Hill, Mary F. Mahon, Claire L. McMullin
Summary: The copper(i) alumanyl derivative reacts with up to three equivalents of various terminal alkynes, resulting in the sequential formation of cuprous (hydrido)(alkynyl)aluminate, (alkenyl)(alkynyl)aluminate, and bis(alkynyl)aluminate derivatives. The alkene liberation process in the latter step is a unique case of alkyne transfer semi-hydrogenation.
Article
Chemistry, Inorganic & Nuclear
Rex S. C. Charman, Thomas M. Horsley Downie, Thomas H. Jerome, Mary F. Mahon, David J. Liptrot
Summary: Frustrated Lewis pairs (FLPs) are widely applied catalysts that can react with various substrates, including water, hydrogen, and phenylacetylene. The reactivity of a specific FLP, (6-Dipp)CuC(=(NBu)-Bu-t)Bpin, was explored through synthetic studies and characterization techniques.