AI Article Synopsis
Article Abstract
The preparation, crystal structures and magnetic properties of the copper(II) complexes of formula [Cu(2)(tppz)(H(2)O)(2)(CF(3)SO(3))(4)] (1), [Cu(tppz)(CrO(4))](n) x 3nH(2)O (2) and [Cu(4)(tppz)(4)(H(2)O)(4)(MoO(4))(2)](CF(3)SO(3))(4) x 7 H(2)O (3) [tppz = 2,3,5,6-tetrakis(2-pyridyl)pyrazine] are reported. Complex 1 is a dinuclear species where tppz adopts a bis-tridentate bridging mode with an intramolecular copper-copper separation of 6.5221(6) A. Each copper(II) ion in 1 has an elongated octahedral geometry with three tppz nitrogen atoms and a water molecule in the equatorial positions and two triflate oxygen atoms occupying the axial sites. Complex 2 is a uniform copper(II) chain where the copper atoms are bridged by two oxygen atoms of the chromate group (mu(1,2)-CrO(4)), the value of the intrachain metal-metal separation being 4.2614(5) A. Each copper(II) ion in 2 exhibits a somewhat distorted square pyramidal geometry with three nitrogen atoms from a tridentate tppz ligand and a chromate oxygen atom in the basal plane and an oxygen atom of a symmetry-related chromate group in the apical position. Complex 3 is a cyclic tetranuclear compound where peripheral [Cu(tppz)(H(2)O)](2+) units are connected through two molybdate groups, each one adopting the mu(1,1,2)-MoO(4) bridging mode. Regular alternating five [Cu(1) and Cu(4)] and six [Cu(2) and Cu(3)] coordinated copper(II) ions occur in 3 with distorted square pyramidal CuN(3)O(2) and elongated octahedral CuN(3)O(3) surroundings, respectively. The four copper atoms in 3 have in common the presence of a molybdate-oxygen and three tppz-nitrogen atoms in the basal [Cu(1) and Cu(4)]/equatorial [Cu(2) and Cu(3)] planes and a water molecule in the apical [Cu(1) and Cu(4)]/one axial [Cu(2) and Cu(3)] positions whereas the remaining axial position is occupied by a molybdate-oxygen [Cu(2) and Cu(3)]. The shorter intramolecular copper-copper separation is 3.371(1) A [Cu(2)...Cu(3)], the other ones varying in the range 5.537(1)-6.301(1) A. The investigation of the magnetic properties of 1-3 in the temperature range 1.9-295 K has shown the occurrence of intermediate antiferro- [J = -48.0(1) cm(-1) with H = -JS(1) x S(2) (1)], weak ferro- [J = +0.28(1) cm(-1) with H = -JSigma(i)S(i) x S(i+I) (2)] and coexistence of weak ferro- and antiferromagnetic interactions [J(1) = +2.38(2) cm(-1), J(2) = +0.56(2) cm(-1) and J(3) = -1.53(2) cm(-1) with H = -J(1) (S(2) x S(3)) + J(2) (S(1) x S(3) + S(2) x S(4)) + J(3) (S(1) x S(2) + S(3) x S(4)) (3)] between the copper(II) ions across bis-tridentate tppz (1), mu(1,2)-CrO(4) (2), di-mu(1,1)-MoO(4) and mu(1,2)-MoO(4) (3) bridges. The values of the magnetic interactions are analyzed in terms of simple orbital symmetry considerations and compared with those reported for parent systems.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1039/b913274k | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Assembling the Puzzle of Coparsite Polymorphism: Synthesis, Thermal Expansion, and Quantum Magnetism of α- and β-CuO(VO)Cl.
Inorg Chem
December 2024
Felix Bloch Institute for Solid-State Physics, Leipzig University, Linnestrasse 5, 04103 Leipzig, Germany.
Two new dimorphic spin-1/2 quantum magnets, α- and β-CuO(VO)Cl, were synthesized via a chemical vapor transport method that emulates mineral formation in volcanic fumaroles. α-CuO(VO)Cl () is a pure vanadate analogue of the coparsite mineral characterized by [OCu] 1 single rods, whereas β-CuO(VO)Cl () adopts a new structure type with the [OCu] 2 layered topology. The thermal expansions of both and studied by high-temperature single-crystal X-ray diffraction are reported.
View Article and Find Full Text PDFUnveiling the Structural Effects in Hybrid Copper Phosphonate Frameworks for Selective Electrocatalytic CO Reduction Reaction.
Inorg Chem
November 2024
Department of Chemistry, National Institute of Technology Kurukshetra, Kurukshetra, Haryana 136119, India.
Article Synopsis
- Electrochemical CO reduction can convert carbon dioxide into valuable energy sources, and two new copper-based organophosphonates have been developed to facilitate this process, focusing on turning CO into CHOH.
- The two compounds, with distinct structures, show varying selectivity for producing CHOH as the main product and CHCOOH as a secondary product, with one compound achieving better results by reducing unwanted side reactions.
- The effectiveness of these compounds as electrocatalysts is linked to their unique copper site ratios and stability of intermediates, making them potential candidates for photocatalytic applications as well.
Novel dinuclear open copper complexes involving π-stacking on the basis of chiral binaphthyl phosphoric acid {()-PhosH}: structural, magnetic and optical properties.
Dalton Trans
November 2024
Área de Química Inorgánica, Departamento de Química, Universidad de La Laguna, C/Astrofísico Francisco Sánchez 3, 38071 La Laguna, Spain.
This research embarked on the study of a new binaphthyl phosphate scaffold of copper. There are two independent neutral complexes in the asymmetric unit: Cu1/Cu2 (I) and Cu3/Cu4 (II) from a similar structure to , with one arm formed by an intra-hydrogen bond between the water molecule bonded to the copper and the phosphine oxide (PO) moieties. Moreover, in the first complex two water and one ketone molecule complete the coordination sphere of the two-copper metals, instead, in the second one, one water and two ketone molecules.
View Article and Find Full Text PDFSyntheses, crystal structures of copper (II)-based complexes of sulfonamide derivatives and their anticancer effects through the synergistic effect of anti-angiogenesis, anti-inflammation, pro-apoptosis and cuproptosis.
Eur J Med Chem
December 2024
College of Pharmacy, Guilin Medical University, Guangxi, Guilin, 541004, China. Electronic address:
Three novel copper(II)-based complexes Cu-1, Cu-2, and Cu-3 containing sulfamethoxazole or sulfamethazine ligand were obtained, and their single structures were characterized. Both Cu-1 and Cu-3 show a broad spectrum of cytotoxicity than Cu-2, and Cu-1 is more cytotoxic than Cu-3. What's interesting is that Cu-1 can exhibit obvious inhibitory effect on the growth of human triple-negative breast cancer in vivo and vitro through anti-proliferative, anti-angiogenic, anti-inflammatory, pro-apoptotic and cuproptotic synergistic effects.
View Article and Find Full Text PDFMilling-Induced "Turn-off" Luminescence in Copper Nanoclusters.
Inorg Chem
October 2024
DST Unit of Nanoscience (DST UNS) and Thematic Unit of Excellence (TUE), Department of Chemistry, Indian Institute of Technology, Madras, Chennai 600036, India.
Atomically precise copper nanoclusters (NCs) attract research interest due to their intense photoluminescence, which enables their applications in photonics, optoelectronics, and sensing. Exploring these properties requires carefully designed clusters with atomic precision and a detailed understanding of their atom-specific luminescence properties. Here, we report two copper NCs, [Cu(MNA)(DPPE)] and [Cu(MNA-H)], shortly Cu and Cu, protected by 2-mercaptonicotinic acid (MNA-H) and 1,2-bis(diphenylphosphino)ethane (DPPE), showing "turn-off" mechanoresponsive luminescence.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!