Dalton Transactions

doi: 10.1039/C9DT90174Dpmid: N/A

doi: 10.1039/c9dt90174dpmid: N/A

doi: 10.1039/C9DT90175Bpmid: N/A

doi: 10.1039/c9dt90175bpmid: N/A

doi: 10.1039/C9DT90176Kpmid: N/A

doi: 10.1039/c9dt90176kpmid: N/A

Wang, S.; Bruneau, C.; Renaud, J.-L.; Gaillard, S.; Fischmeister, C.

doi: 10.1039/c9dt02165epmid: 31271393

2,2′-Dipyridylamines (dpa) and related compounds belong to the family of polydentate nitrogen ligands. More than a century has passed since their first report but new complexes and applications have been emerging in recent years owing to the versatility of dpa-based architectures. This review aims to present and highlight the main achievements attained with dpa-containing metal complexes in the domains of homogeneous catalysis and luminescent materials.

Liu, Danjinkun; Zhang, Guohua; Gao, Bo; Li, Bao; Wu, Lixin

doi: 10.1039/c9dt01780apmid: 31265034

A triazine derivative with two short alkyl chains was covalently grafted onto a disk-like polyoxometalate cluster on both sides, and an amphiphilic polyanionic cluster was obtained. The linear cluster complex showed phase separation in polar and non-polar solutions and self-assembled into spherical, planar, and helical aggregates in turn with the solution polarity decreasing from the methanol/water to the chloroform/n-hexane mixture. Accompanied by morphological changes, the self-assembled bilayer structure varied from a regular bilayer structure either partially or fully, to an over interdigitated bilayer structure and finally to a partially inverse interdigitated bilayer structure. Moreover, induced chirality took place and was amplified in the helical assembly via the modulation of counter-cations and solvent polarity.

Yoshida, Takefumi; Takaishi, Shinya; Kumagai, Shohei; Iguchi, Hiroaki; Mian, Mohammad Rasel; Yamashita, Masahiro

doi: 10.1039/c9dt01684hpmid: 31241098

We performed X-ray absorption fine structure (XAFS) measurements on three representative bromo-bridged palladium compounds. In the X-ray absorption near-edge structure (XANES) spectra, the averaged-valence (AV) compound, [Pd3+(dabdOH)2Br]Br2 (1: dabdOH = (2S,3S)-2,3-diaminobutane-1,4-diol), and the mixed-valence (MV) compound, [Pd2+(en)2][Pd4+(en)2Br2](ReO4)4 (2), showed significant differences in their spectra. In [Pd(en)2Br](Suc-C5)2·H2O (3: en = ethylenediamine, Suc-C5 = dipentylsulfosuccinate), which exhibits an MV–AV phase transition, on the other hand, the spectroscopic difference between below and above the phase transition temperature was hardly observed due to the subtle difference in the oxidation states. In the extended X-ray absorption fine structure (EXAFS) spectra, a clear difference in the Pd–Br correlation region was observed upon the phase transition.

Abbasi, Parisa; Athanasopoulou, Angeliki A.; Mazarakioti, Eleni C.; Gagnon, Kevin J.; Teat, Simon J.; Escuer, Albert; Pilkington, Melanie; Stamatatos, Theocharis C.

doi: 10.1039/c9dt01998gpmid: 31274137

The synthesis of a new {Ni8} cluster bearing tetrazolate- and azido-bridging ligands, and supported by chelating α-methyl-2-pyridine-methanol (mpmH) groups, is described herein. The reported compound has a unique trapezoidal prismatic topology, resulting from an unexpected in situ click reaction between the MeCN reaction solvent and the N3− ions under mild, room-temperature conditions. Such a click chemistry approach to the preparation of 0-D compounds is relatively unexplored and represents a fruitful strategy for the synthesis of new coordination clusters and molecule-based magnetic materials.