A self-assembled Cu(<scp>ii</scp>)<sub>4</sub>[2 × 2] grid with organic radicals
作者:Konstantin V. Shuvaev、Stephen Sproules、J. Mikko. Rautiainen、Eric J. L. McInnes、David Collison、Christopher E. Anson、Annie K. Powell
DOI:10.1039/c2dt31946b
日期:——
designed for a self-assembled [2 × 2] grid system. HLnitnitnitnit is not stable in methanol and slowly undergoes a disproportionation, during which the nitronyl nitroxide radical converts to the diamagnetic amidino oxide. In situ reaction of HLnitnitnitnit with Cu(BF4)2 in methanol depending on the reaction time affords self-assembled [2 × 2] grids (Lnitnitnitnit)2(L)2Cu(II)4(BF4)4·CH3OH (1) or (Lnitnitnitnit)0
Self-assembly of a unique hexadecanuclear [4 × (2 × 2)]-Pb<sub>16</sub> ‘grid of grids’ type structure
作者:Stuart T. Onions、Anthony M. Frankin、Peter N. Horton、Michael B. Hursthouse、Craig J. Matthews
DOI:10.1039/b308512k
日期:——
A new ligand containing a linear sequence of four-tridentate chelating subunits built around alkoxide and pyrimidine bridging groups undergoes a spontaneous self-assembly process with Pb(CF3SO3)2 to produce a unique hexadecanuclear [4 Ã
(2 Ã 2)]
âgrid of gridsâ type structure with external dimensions of 26 Ã .
Unexpected Ni(ii) and Cu(ii) polynuclear assemblies—a balance between ligand and metal ion coordination preferences
作者:Kontantin V. Shuvaev、Santokh S. Tandon、Louise N. Dawe、Laurence K. Thompson
DOI:10.1039/c0cc00150c
日期:——
Polytopic ligand design involves matching the coordination pocket composition with the metal ion coordination âalgorithmâ, but despite targeting [4 Ã 4] grids as the final outcome, metal ion preferences and ligand control can lead to widely varying complexes in the self-assembly process with Ni(II) and Cu(II).
hexanuclear self-assembled fluorescent species provided better insight into its chemistry, e.g. coordination environment and binding mode, unlike most of the metal sensors due to the lack of a single-crystal structure of the metal sensor complex. Cytotoxicity assay and bioimaging were performed in living cells (Vero cells), giving green fluorescent images. Fluorescence lifetime measurements and theoretical calculations
合成了一种芘附加的联吡啶腙基配体HL,并通过光谱方法对其进行了表征。HL与Cu( II )络合后,通过自组装形成具有高缔合常数的六核桨轮金属-有机大环(MOM) ,分子式为[Cu 6 L 6 (NO 3 ) 6 ]。在这种六核 Cu( II ) 配合物中证明了分子间和分子内 π-π 相互作用。此外,观察到HL有可能检测到痕量的 Cu( II) 离子在生理 pH 下的水性介质中的各种生物相关金属离子中选择性地进行。HL具有良好的细胞渗透性和生理条件下的高溶解度以及较高的IC 50值,可以检测活细胞中的铜(II )离子。低检测限、高灵敏度和良好的重现性使这种铜传感器非常有前景。基于荧光滴定法,发现配体与Cu( II )之间形成的络合物(MOM)为1:1,并通过ESI-MS确认。此外,六核自组装荧光物质的单晶研究提供了对其化学性质的更好了解,例如配位环境和结合模式,不像大多数金属传感器,由于金属