Article
Chemistry, Inorganic & Nuclear
Jett T. Janetzki, Maxim G. Chegerev, Gemma K. Gransbury, Robert W. Gable, Jack K. Clegg, Roger J. Mulder, Guy N. L. Jameson, Alyona A. Starikova, Colette Boskovic
Summary: Spin crossover complexes with the ability to switch between low spin and high spin states have potential applications in sensing, displays, and molecular electronics. This study focuses on dinuclear spin crossover complexes and investigates the influence of bridging ligands on the spin crossover behavior. The synthesis and characterization of three complexes are reported, and both solid-state and solution measurements are performed to gain insights into the interconversion between different spin states.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Mario Palacios-Corella, Javier Ramos-Soriano, Manuel Souto, Duarte Ananias, Joaquin Calbo, Enrique Orti, Beatriz M. Illescas, Miguel Clemente-Leon, Nazario Martin, Eugenio Coronado
Summary: This study designed and synthesized a family of hexakis-substituted [60]fullerene adducts with a well-known ligand for spin-crossover systems. Experimental and theoretical evidence showed that these molecular scaffolds can form polynuclear SCO complexes in solution, and retain SCO properties in the solid state.
Article
Chemistry, Inorganic & Nuclear
Alexander R. Craze, Hikaru Zenno, Michael C. Pfrunder, John C. McMurtrie, Shinya Hayami, Jack K. Clegg, Feng Li
Summary: This study investigates the interaction between crystal packing, intermolecular interactions, and the magnetic behavior of SCO materials. The research found that a more separated array of SCO units leads to more extensive spin-transitions, while a tightly arranged lattice environment stabilizes the low-spin state.
INORGANIC CHEMISTRY
(2021)
Review
Biochemistry & Molecular Biology
Dawit Tesfaye, Wolfgang Linert, Mamo Gebrezgiabher, Yosef Bayeh, Fikre Elemo, Taju Sani, Nandakumar Kalarikkal, Madhu Thomas
Summary: Supramolecular architectures formed by combining inorganic metal cations and organic ligands through self-assembly are a technique in modern chemical science. These multi-nuclear systems have various applications including sensing, storage/cargo, display, and molecular switching. Iron(II) mediated spin-crossover (SCO) supramolecular architectures with Schiff base ligands have gained attention due to their unique structures and potential applications. This review article discusses the various geometrical possibilities and the structural and SCO behavior of these complexes.
Review
Chemistry, Inorganic & Nuclear
Manoj Kumar, Atresh Kumar Singh, Alok Kumar Singh, Rajesh K. Yadav, Satyam Singh, Atul P. Singh, Amit Chauhan
Summary: Schiff bases have been widely studied in coordination chemistry for their reactivity and adaptable metal complexes. They have numerous applications in various fields, including catalysis, material science, and bioinorganic chemistry. This review focuses on Schiff bases derived from salicylaldehyde and their derivatives, with a specific emphasis on their synthesis, characterization, and applications in metal complexes. The article provides important knowledge for researchers in this field and encourages further research in Schiff base complexes.
COORDINATION CHEMISTRY REVIEWS
(2023)
Review
Chemistry, Medicinal
Ying Sun, Yunlong Lu, Mianli Bian, Zhibin Yang, Xiaoyan Ma, Wukun Liu
Summary: The Pt(II) and Au(III) Schiff-base complexes as potential antitumor agents have shown remarkable biological activities and good stability. They act through different mechanisms, providing a feasible solution for improving the side effects of metal chemotherapy.
EUROPEAN JOURNAL OF MEDICINAL CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Qingqing Wen, Thayalan Rajeshkumar, Laurent Maron, Xuebing Leng, Yaofeng Chen
Summary: The first rare-earth metal complex bearing both hydrido- and imido-ligands, a hydrido- and imido-bridged dinuclear ytterbium(III) complex, was successfully synthesized via an unprecedented redox reaction. DFT calculation revealed that the N-2 release from azido compound in the presence of ytterbium(II) is kinetically facile due to cooperative effects. The reactivity investigation of the complex demonstrated redox, addition, and sigma-bond metathesis reactivities.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Hany M. Abd El-Lateef, Mai M. Khalaf, Amer A. Amer, Mahmoud Kandeel, Antar A. Abdelhamid, Aly Abdou
Summary: This study synthesized three new CrAz(2), MnAz(2), and FeAz(2) complexes and investigated their properties through various analyses. The azo-ligand, 4-(2-hydroxyphenylAzo)-1-naphthol(Az), binds with metal ions through its nitrogen and oxygen atoms. The metal complexes exhibit higher inhibitory activity against certain organisms compared to the free ligand.
Review
Chemistry, Inorganic & Nuclear
Olesia Kucheriv, Igor O. Fritsky, Il'ya A. Gural'skiy
Summary: SCO compounds are a large class of switchable coordination complexes that can change their electronic configurations under different external stimuli, showing potential applications in various fields. Cyanometallic frameworks exhibit SCO properties, providing insights into new materials with desired spin-crossover characteristics, with the reduction to nanometre scale impacting their performance.
INORGANICA CHIMICA ACTA
(2021)
Article
Chemistry, Medicinal
Hadi Amiri Rudbari, Arezoo Saadati, Mahnaz Aryaeifar, Isabel Correia, Fernanda Marques, Olivier Blacque, Nicola Micale
Summary: A series of oxidovanadium(IV) complexes were synthesized and characterized, showing good anticancer activity in ovarian and breast cancer cells. The newly synthesized V(IV)O complexes exhibited the highest cytotoxicity among all tested compounds.
BIOORGANIC & MEDICINAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Sandhya Singh, Sally Brooker
Summary: A new family of bis-bidentate azole-triazole Rat ligands and the corresponding spin-crossover and redox active dinuclear helicates have been prepared and characterized. The study shows that these helicates exhibit SCO activity in solution, and the choice of azole in the Rat ligand can affect their redox potential.
Article
Chemistry, Inorganic & Nuclear
Shu-Ya Zhang, Hui-Ying Sun, Run-Guo Wang, Yin-Shan Meng, Tao Liu, Yuan-Yuan Zhu
Summary: The self-assembly of multinuclear SCO complexes is appealing for the discovery of unique properties. In this work, three dinuclear cobalt(II) complexes were prepared using a complementary terpyridine ligand pair strategy. The complexes show different spin crossover behaviors and demonstrate the practicality of the complementary terpyridine ligand pairing in constructing multinuclear SCO-active compounds.
DALTON TRANSACTIONS
(2022)
Article
Chemistry, Multidisciplinary
Payal Malik, Isha Jain
Summary: A compound assisted by Zn(II) self-assembled and its double helical structure was confirmed using single crystal X-ray diffraction analysis. The compound showed high sensitivity towards nitroaromatics and exhibited both static and dynamic quenching mechanisms.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Veronica Jornet-Molla, Carlos Gimenez-Saiz, Dmitry S. Yufit, Judith A. K. Howard, Francisco M. Romero
Summary: The spin crossover salt [Fe(bpp)(2)](isonicNO)(2). 2.4 H2O undergoes a very abrupt spin crossover at 274.4 K, with reversible response to light irradiation or temperature change; Isotopic effects in the thermomagnetic behavior highlight the significance of hydrogen bonds in determining the magnetic state; The compound can be reversibly dehydrated to produce 1, which also exhibits spin crossover coupled with H-bond isomerization, resulting in strong kinetic effects in the thermomagnetic properties.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Chemistry, Inorganic & Nuclear
Komala Pandurangan, Anthony B. Carter, Paulo N. Martinho, Brendan Gildea, Tibebe Lemma, Shang Shi, Aizuddin Sultan, Tia E. Keyes, Helge Mueller-Bunz, Grace G. Morgan
Summary: This study reports the structural and magnetic properties of a new spin crossover complex in lattices with different counterions. Comparison experiments show that alkylation effectively inhibits the thermal spin crossover pathway. Further investigations confirm the stability of the high spin state in dilute environments.
Article
Chemistry, Multidisciplinary
Sayed Muktar Hossain, Sujit Kamilya, Sounak Ghosh, Radovan Herchel, Mikhail A. Kiskin, Sakshi Mehta, Abhishake Mondal
Summary: The study shows that predetermined diverse topology and desired properties can be achieved by strategically designing the ligand and properly utilizing a coligand. The effect of the ligand field on structure and magnetic properties is demonstrated through the design of two new Pyclen-based macrocyclic N4 ligands. A series of cobalt complexes are synthesized and characterized, revealing the impact of ligand modification and variation of coligand on the coordination environment and topology of Co(II) complexes. Detailed theoretical studies provide further understanding of the experimental results.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Chemistry, Inorganic & Nuclear
Kuheli Pramanik, Zvonko Jaglicic, Radovan Herchel, Paula Brandao, Narayan Ch. Jana, Anangamohan Panja
Summary: A series of Ln(III) complexes with different ligands were synthesized and characterized. Some of the complexes exhibited zero field single-molecule magnet behavior, while others showed field-induced single-molecule magnet behavior. The single-molecule magnet performance was significantly enhanced by introducing a methyl substitution in the ligand framework.
DALTON TRANSACTIONS
(2023)
Article
Pharmacology & Pharmacy
Zdenek Travnicek, Tomas Malina, Jan Vanco, Marek Sebela, Zdenek Dvorak
Summary: The paper describes the synthesis and characterization of six heteroleptic copper(II) complexes with different ligands. The results showed that complex 2 exhibited high cytotoxicity against cancer cells, while showing low toxicity against healthy cells. Further experiments revealed that complex 2 induced apoptosis and autophagy in A2780 cancer cells through the activation of caspases 3/7, ROS overproduction, and autophagy induction.
Article
Chemistry, Multidisciplinary
Nikoleta Malinova, Jana Jurakova, Barbora Brachnakova, Jana Dubnicka Midlikova, Erik Cizmar, Vinicius Tadeu Santana, Radovan Herchel, Milan Orlita, Ivan Mohelsky, Jan Moncol, Petr Neugebauer, Ivan Salitros
Summary: The synthesis of a mononuclear Co(II) complex 1 using a novel tridentate ligand L was investigated. The molecular structure of complex 1 was confirmed by single-crystal X-ray structural analysis and noncovalent contacts were examined. The magnetic properties of complex 1 were analyzed using the Griffith-Figgis Hamiltonian, and calculations and spectroscopic study showed good agreement. The AC magnetic investigation revealed slow relaxation of magnetization in complex 1 with involvement of direct, Raman, and Orbach processes.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Chemistry, Multidisciplinary
Biswarup Dutta, E. Carolina Sanudo, Radovan Herchel, Debashis Ray
Summary: This study discovered two different types of mixed-valence tetranuclear cobalt complexes through the reaction of the multisite ligand H3L with Co(ClO4)2 center dot 6H2O in the presence of ancillary ligands NaPiv and NH4SCN. The first type of complex achieved connectivity for different numbers of CoIII and CoII ions through water-molecule-derived HO- plus O2- linkers and ligand-anion-based double phenolato bridges, while the second type achieved aggregation through terminal thiocyanate coordination. The structural distortions in these two types of aggregates lead to different magnitudes of easy-axis magnetic anisotropy and a small but non-negligible transverse component.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Chemistry, Multidisciplinary
Ivan Nemec, Lucie Kotaskova, Radovan Herchel
Summary: We crystallized the Schiff-base iron(III) spin-crossover complex [Fe(3,5Cl-L5)(NCSe)] from different solvent mixtures and found significant differences in magnetic properties. The crystal structures of the low-spin and high-spin phases were studied both theoretically and experimentally.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Chemistry, Inorganic & Nuclear
Kamil Kotrle, Mihail Atanasov, Frank Neese, Radovan Herchel
Summary: A detailed computational study was conducted on sandwich dysprosium double-decker complexes to assess the effect of structural modifications on their magnetic properties and identify potential candidates with superior performance.
INORGANIC CHEMISTRY
(2023)
Article
Crystallography
Tomas Silha, Radovan Herchel, Ivan Nemec
Summary: A series of five novel Mn-salen-based compounds (1a-1c, 2a, 2b) were synthesized through the reaction between precursor chloride complexes and potassium silver/gold dicyanide. The compounds were structurally and magnetically characterized. The findings revealed that the Mn(III) central atoms exhibited axial magnetic anisotropy, and weak magnetic exchange was observed in compounds with a special supramolecular topology involving O-H···O hydrogen-bonded dimers.
Article
Chemistry, Inorganic & Nuclear
Jana Jurakova, Ondrej F. Fellner, Soren Schlittenhardt, Sarka Vavreckova, Ivan Nemec, Radovan Herchel, Erik Cizmar, Vinicius Tadeu Santana, Milan Orlita, Denis Gentili, Giampiero Ruani, Massimiliano Cavallini, Petr Neugebauer, Mario Ruben, Ivan Salitros
Summary: Two new hexacoordinated Co(II)-based single-ion magnets were synthesized and characterized. The complexes exhibited metal-centered coordination with nitrate anions and a 2,6-bis(1H-benzimidazole-2-yl)pyridine ligand with n-octyl or n-dodecyl chains. The presence of long aliphatic chains allowed for their solubility in low polarity and volatile solvents, enabling the preparation of microstructural layers and patterns on relevant substrates using wet lithographic techniques. The complexes displayed positive axial D parameters and showed field-induced slow relaxation of magnetization.
INORGANIC CHEMISTRY FRONTIERS
(2023)
Article
Chemistry, Inorganic & Nuclear
Biswarup Dutta, Thierry Guizouarn, Fabrice Pointillart, Kamil Kotrle, Radovan Herchel, Debashis Ray
Summary: A new family of binuclear Ni-II-Ln(III) complexes [NiLn(L)(2)(NO3)(3)]0.5H(2)O (Ln = Gd, 1; Tb, 2; Dy, 3; Ho, 4; Er, 5; Yb, 6; Y, 7) was synthesized using a thioether group-bearing Schiff base. These complexes exhibit distorted pseudo-octahedral geometry for the Ni-II center and distorted bicapped square-antiprism geometry for the Ln(III) centers. The study highlights the mutual distortion of coordination geometry induced by the flexibility of the ligand backbone and the simultaneous binding of two different metal ions.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Multidisciplinary
Narayan Ch. Jana, Marko Jagodic, Paula Brandao, Moumita Patra, Radovan Herchel, Zvonko Jaglicic, Anangamohan Panja
Summary: Six new Ni-II complexes with different N3O donor Schiff base ligands have been synthesized and characterized, showing ferromagnetic interaction through bridging pseudohalides. The cyanate-bridged complexes have lower ferromagnetic coupling constant J compared to azide analogues due to the presence of polarizable p systems and two different N and O donor atoms. The inclusion of these new complexes in the series of mu(1,1)-NCO bridged systems allows for a detailed analysis of the magneto-structural correlation, revealing that the J value increases with an increase in bridging angles and is also influenced by the Ni1-Ni2-N-b-X-t dihedral angle.
Article
Biochemistry & Molecular Biology
Zdenek Travnicek, Jan Vanco, Jan Belza, Jan Hosek, Zdenek Dvorak, Rene Lenobel, Igor Popa, Karel Smejkal, Pavel Uhrin
Summary: Motivated by the success of Auranofin, a gold(I) metallotherapeutic, in treating inflammation and cancer, the researchers prepared and characterized a [Au(kin)(PPh3)] complex (1) with kinetin. In vitro studies showed that complex (1) had significant cytotoxicity against human cancer cell lines, outperforming Cisplatin and comparable to Auranofin. Furthermore, it was found to positively influence PPAR gamma, reducing inflammation. The cellular effects of complex (1) were also investigated, revealing its impact on cell cycle, apoptosis, ROS production, caspase activation, mitochondrial membrane potential, and proteomic analysis.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Chemistry, Inorganic & Nuclear
Petr Halas, Ivan Nemec, Radovan Herchel
Summary: The hexacoordinate Co(II) complex [Co(neo)2(cin)][BPh4]center dot 1/2Me2CO was synthesized and characterized. The complex exhibits large magnetic anisotropy and slow magnetization relaxation under an applied field, behaving as a field-induced single-molecule magnet.
Article
Chemistry, Physical
Jorge Navarro Giraldo, Jakub Hruby, Sarka Vavreckova, Ondrej F. Fellner, Lubomir Havlicek, Davonne Henry, Shehan de Silva, Radovan Herchel, Miroslav Bartos, Ivan Salitros, Vinicius T. Santana, Paola Barbara, Ivan Nemec, Petr Neugebauer
Summary: This study presents both theoretical and experimental investigations of two tetracoordinate Co(ii)-based complexes with semi-coordination interactions. The results show that these interactions enhance the thermal and structural stability of the compounds, allowing successful deposition on graphene. The compounds exhibit axial magnetic anisotropy and weak intermolecular antiferromagnetic coupling, as confirmed by various experimental techniques and theoretical calculations. Additionally, the study explores the electrical properties of these compounds on graphene and demonstrates electron transfer-induced n-type doping of graphene.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Inorganic & Nuclear
Weiyang Li, Xiaochun Li, Koen Robeyns, Mariusz Wolff, Joseph Kfoury, Julianna Olah, Radovan Herchel, Serhiy Demeshko, Franc Meyer, Yann Garcia
Summary: In this study, two new types of edge-bridged spin crossover supramolecular cages were constructed, and their magnetic properties were investigated in the presence of different solvents and anions.
DALTON TRANSACTIONS
(2023)
