Dalton Transactions

doi: 10.1039/c1dt90043apmid: N/A

doi: 10.1039/c1dt90044gpmid: N/A

doi: 10.1039/c1dt90046cpmid: N/A

Ananikov, Valentine P.; Beletskaya, Irina P.

doi: 10.1039/c0dt01277gpmid: 21321732

A novel type of nanoparticles have been designed based on self-organization of the metal centers with organic functional groups. Size- and shape-controlled synthetic procedures were developed to prepare nanostructured Pd and Ni particles in high yields from easily available precursors. The presence of the non-metallic functional groups in the particle’s core forced the metal centers to adopt a divalent oxidation state bearing polar chemical bonds (“nanosalt”). The Pd and Ni particles were excellent catalysts to accomplish a highly selective synthetic route to vinyl chalcogenides. The mechanisms of the catalytic reactions via the heterogeneous and homogeneous pathways were revealed and studied in detail.

Li, Fengyan; Xu, Lin

doi: 10.1039/c0dt00691bpmid: 21321727

Polyoxomolybdates, an important branch in polyoxometalates chemistry, present complicated solution chemistry and unmatched physicochemical properties, which endows us with both great opportunities and considerable challenges in creating new functional materials. This perspective highlights the recent development on the coordination assembly of transition-metal-substituted heteropolymolybdates by using labile lacunary heteropolymolybdates as inorganic multidentate ligands. A series of strategies have been used to stabilize the lacunary heteropolymolybdate building blocks. Finally, we introduce some researches on the modification of polymolybdates by organic groups in aqueous media, which may shed light on the green chemistry of the functionalization of polyoxomolybdates.

Zheng, Yong; Kong, Xiang-Jian; Long, La-Sheng; Huang, Rong-Bin; Zheng, Lan-Sun

doi: 10.1039/c1dt10044kpmid: 21394357

Three enantiopure isostructural sandwich-type clusters, LnIII3MnIII6 (Ln = Dy (1), Tb (2) and Gd (3)) have been synthesized through reactions of a chiral Schiff-base ligand ((S,E)-4-(2-hydroxybenzylideneamino)-2-hydroxybutanoic acid, H3L) with manganese and lanthanide ions, showing intramolecular antiferromagnetic interaction.

Hou, Jungang; Wang, Zheng; Cao, Rui; Jiao, Shuqiang; Zhu, Hongmin

doi: 10.1039/c0dt01847cpmid: 21387051

TaON modified by polyaniline (PANI), was prepared through a facile chemisorption process. PANI-modified TaON composites with good stabilities exhibit significantly higher photocatalytic activities than that of neat TaON on degradation of RhB under visible light irradiation, which may result from an enhancement of electron–hole separation between PANI and TaON.

Grala, Agnieszka; Ejfler, Jolanta; Jerzykiewicz, Lucjan B.; Sobota, Piotr

doi: 10.1039/c1dt10087dpmid: 21394328

Alkyl-(S,S)-O-lactyllactate was prepared by chemoselective alcoholysis of lactide LA mediated by a magnesium catalyst. When ROH reacted with LA it yielded the ring-opened product R-(S,S)-O-lactyllactate exclusively, which remained intact as long as LA was present in the reaction mixture. Consumption of LA caused the reaction to proceed further giving R-(S)-lactate.

Imai, Motoharu; Sato, Akira; Udono, Haruhiko; Imai, Yoji; Tajima, Hiroyuki

doi: 10.1039/c1dt10071hpmid: 21384054

A ternary type-I Si clathrate K8Ga8Si38 has been revealed to be an indirect band gap semiconducting material with an energy gap (Eg) of approximately 0.10 eV, which is much smaller than the calculated Eg value that is 0.15 eV wider than Eg of elemental Si with the diamond-type structure.

Coates, Cristina M.; Hagan, Kenton; Mitchell, Casey A.; Gorden, John D.; Goldsmith, Christian R.

doi: 10.1039/c0dt01556cpmid: 21373666

Iron and manganese complexes with derivatives of bis(2-pyridylmethyl)-1,2-ethanediamine (bispicen) have previously been found to be efficient catalysts for hydrocarbon oxygenation. Methylation can potentially impact the conformation of the ligand around the metal center and the electronic character of the bound metal ion; each of these, in turn, impacts reactivity. Reported are mononuclear manganese(ii) and iron(ii) compounds with bispicen and five increasingly methylated derivatives. The extent and sites of methylation strongly impact the optical and electrochemical properties of the manganese and iron complexes. Increased methylation is correlated with more positive M(iii/ii) reduction potentials. Structural analysis of the Mn(ii) series reveals two ligand conformations that have never been observed for the bispicen framework, cis-β and trans, in addition to the common cis-α conformation. 1H NMR spectra of the structurally characterized iron compounds are consistent with mixtures of these conformers, suggesting that bispicen coordination is both more flexible and more dynamic than previously thought.