Dalton Transactions

doi: 10.1039/d5dt90069gpmid: N/A

doi: 10.1039/d5dt90070kpmid: N/A

Nagendran, Selvarajan; Murugavel, Ramaswamy; Rivard, Eric

doi: 10.1039/d5dt90053kpmid: 40126528

Guest editors Selvarajan Nagendran, Ramaswamy Murugavel and Eric Rivard introduce the Dalton Transactions “Main group element compounds in materials and catalysis” themed collection.

Batool, Amna; Kopp, Ina; Kubeil, Manja; Bachmann, Michael; Andrews, Philip C.; Stephan, Holger

doi: 10.1039/d5dt00163cpmid: 40040450

The use of bismuth and its compounds in biomedicine has developed rapidly in recent years. Due to their unique properties, there are great opportunities for the development of new non-invasive strategies for the early diagnosis and effective treatment of cancers. This perspective highlights key fabrication methods to generate well-defined and clinically relevant bismuth materials of varying characteristics. On the one hand, this opens up a wide range of possibilities for unimodal and multimodal imaging. On the other hand, effective treatment strategies, which are increasingly based on combinatorial therapies, are given a great deal of attention. One of the biggest challenges remains the selective tumour targeting, whether active or passive. Here we present an overview on new developments of bismuth based materials moving forward from a simple enrichment at the tumour site via uptake by the mononuclear phagocytic system (MPS) to a more active tumour specific targeting via covalent modification with tumour-seeking molecules based on either small or antibody-derived molecules.

Naranjo, Jesús; Castro-Osma, José A.; de la Cruz-Martínez, Felipe; Lara-Sánchez, Agustín

doi: 10.1039/d4dt03469dpmid: 40070206

The rapid depletion of fossil fuels and, more importantly, the environmental challenges associated with their use, have driven efforts to transition toward biomass-derived platform molecules with the aim of producing more biodegradable and functional materials. In this context, the catalytic ring-opening polymerization (ROP) and ring-opening copolymerization (ROCOP) of cyclic monomers have emerged as effective synthetic routes for the controlled production of polyesters with defined properties. Among the catalysts developed for these processes, those based on calcium are particularly appealing due to the abundance, low cost and biocompatibility of this metal. This Frontier article summarizes recent advancements in the use of calcium-based catalysts for the synthesis of polyesters via ROP and ROCOP of bio-sourced cyclic substrates.

Li, Chengxi; Chen, Qiulin; Zhang, Guohao; Zhang, Gaofeng; Zeng, Qingxin; Hao, Jian; Li, Yinwei

doi: 10.1039/d5dt00453epmid: 40105444

Zinc carbodiimide, Zn(CN2), exhibits negative linear compressibility (NLC) along the c-axis under hydrostatic pressure. Density functional theory calculations indicate that at high pressure, the a- and b-axes shrink, while the infinite –Zn–N–C–N– helical chains elongate through inter-chain Zn–N bonds, leading to expansion of the crystal along the c-axis.

Boym, Mikhail A.; Pototskiy, Roman A.; Podyacheva, Evgeniya S.; Muratov, Dmitry V.; Nelyubina, Yulia V.; Perekalin, Dmitry S.

doi: 10.1039/d5dt00344jpmid: 40094431

Natural R-carvone was converted into chiral 1-aryl-2-methyl-5-isopropyl-cyclohexadienes using a cross-coupling reaction as a key step. These dienes react with RuCl3 to give planar-chiral complexes [(arene)RuCl2]2 in 70–75% yields. Complex [(1-Ph-2-Me-5-iPr-C6H3)RuCl2]2, a chiral analogue of the classical catalyst [(cymene)RuCl2]2, promotes C–H activation of N-methoxy-benzamide and intramolecular insertion of a diazo compound into a C–H bond, but gives products with low stereoselectivity.

Dazem, Cyrielle L. F.; Ruser, Niklas; Svensson Grape, Erik; Inge, A. Ken; Proserpio, Davide M.; Stock, Norbert; Öhrström, Lars

doi: 10.1039/d5dt00271kpmid: 40099455

In the field of metal–organic frameworks, the use of yttrium(iii) cations and the formation of 3D inorganic building units are rather rare. Here we report an yttrium(iii) metal–organic framework based on the V-shaped ditopic linker 4,4′-oxydibenzoate, oba2−: [Y16(μ-OH2)(μ3-OH)8(oba)20(dmf)4]·7H2O·7dmf, 1, which was solvothermally prepared, with single crystal X-ray diffraction revealing an unusual 3D metal secondary building unit. When activated at 200 °C, 1 desolvated to form compound 2, [Y16(μ-OH2)(μ3-OH)8(oba)20]·6H2O, retaining the same structure with a 3% shrinkage in unit cell volume.

Begum, Ayesha; Akram, Manjur O.; Martin, Caleb D.

doi: 10.1039/d5dt00579epmid: 40110640

The dearomative borylation of indoles is challenging and typically requires transition metal catalysts, strong bases, or harsh conditions. We report the metal- and base-free C2-borylation of indoles using bis(1-methyl-ortho-carboranyl)borane as an electrophilic borylating reagent to generate borylated indolenium species under mild conditions.

Sugiyama, Haruki; Arita, Atsuko; Sekine, Akiko; Uekusa, Hidehiro

doi: 10.1039/d4dt01755bpmid: 39932227

N-Salicylideneaminopyridine (SAP) is a well-known organic chromic compound that shows a reversible colour change upon UV light irradiation (photochromism) and upon cooling (thermochromism). Herein, we report novel multi-chromic metal complexes containing SAP derivatives as ligands, viz. [Ni(NCS)2(3,5-t-Bu-SAP)4] (Ni1) and [Co(NCS)2(3,5-t-Bu-SAP)4] (Co1). The Ni1 crystals exhibited both photo- and thermochromism with new colour variations, which were due to the light absorption of the Ni(ii) ions and chromic properties of the SAP ligands. The Co1 crystal also exhibited photo- and thermochromism originating from the SAP ligands. Furthermore, the Co1 crystal exhibited mechanochromism induced by grinding with a mortar, which was considered to be attributable to the change of the Co1 coordination structure. Such a triple-chromic material is rare and very fascinating for the applications of multiple sensors, memory devices, and functional inks.