Self-Assembly in Palladium(II) and Platinum(II) Chemistry: The Biomimetic Approach
作者:Zengquan Qin、Michael C. Jennings、Richard J. Puddephatt
DOI:10.1021/ic020322z
日期:2003.3.1
(mu-1)(3)](6+), M = Pd or Pt, bu(2)bipy = 4,4'-di-tert-butyl-2,2'-bipyridine, and 1 = N-(4-pyridinyl)isonicotinamide, stacks to give dimers by intertriangle NH.OC hydrogen bonding. The binuclear ring complexes [[Pd(LL)(mu-2)](2)](CF(3)SO(3))(4), LL = dppm = Ph(2)PCH(2)PPh(2) or dppp = Ph(2)P(CH(2))(3)PPh(2) and 2 = NC(5)H(4)-3-CH(2)NHCOCONHCH(2)-3-C(5)H(4)N, form transannular hydrogen bonds between
Directing the Crystallization of Dehydro[24]annulenes into Supramolecular Nanotubular Scaffolds
作者:Mitsuharu Suzuki、Juliet F. Khosrowabadi Kotyk、Saeed I. Khan、Yves Rubin
DOI:10.1021/jacs.6b01939
日期:2016.5.11
We have studied the parameters affecting self-assembly, including the nature of the substituent and crystallization conditions, using 10 different dehydro[24]annulene derivatives. In particular, hydrogen-bonding interactions through carbamate groups were found to be especially useful at directing the formation of nanotubular supramolecular assemblies. We have also evaluated the electronic coupling
Pressure induced topochemical polymerization of diiodobutadiyne: a single-crystal-to-single-crystal transformation
作者:Hongjian Jin、Anna M. Plonka、John B. Parise、Nancy S. Goroff
DOI:10.1039/c3ce26851a
日期:——
Diiodobutadiyne forms cocrystals with bis(pyridyl)oxalamides, based on halogen bonds between the pyridine groups of the host and the iodoalkynes of the guest. These interactions align the diyne for topochemical polymerization to form poly(diiododiacetylene) or PIDA. To induce polymerization, the crystals are subjected to pressures of 3.5 GPa or above. Previously, we reported spectroscopic evidence of this pressure-induced polymerization, but attempts to recover single crystals after pressure treatment were unsuccessful. Here we present direct structural evidence of clean single-crystal to single-crystal polymerization in these cocrystals. The structure of the polymer cocrystal was solved from single-crystal diffraction data and is supported by high pressure in situ Raman spectroscopy. Careful analysis of the structural changes suggests that increasing pressure changes the packing of host molecules, and that the flexibility of the pyridine ring orientation enables the polymerization. The new sigma bonds of the polymer form at the expense of the halogen bonds in the starting cocrystal; after polymerization, the iodine atoms are no longer ideally located for strong halogen bonding with the host.
Synthesis of the Stable Ordered Conjugated Polymer Poly(dibromodiacetylene) from an Explosive Monomer
作者:Hongjian Jin、Christopher N. Young、Gary P. Halada、Brian L. Phillips、Nancy S. Goroff
DOI:10.1002/anie.201504713
日期:2015.12
nitrile side groups, in which halogen bonds align the dibromobutadiyne monomers for topochemicalpolymerization. The cocrystals with the bis(nitrile) oxalamide host undergo complete ordered polymerization to PBDA, demonstrated by solid‐state MAS‐NMR, Raman, and optical absorption spectroscopy. Once formed, the polymer can be separated from the host; unlike the monomer, PBDA is stable at room temperature
1 shows high framework stability in common solvents and reversible dehydration–rehydration behaviour. Remarkably, 1 is an especially rare example that exhibits novel solvent-dependent luminescence sensing properties. In DMF, 1 shows selective and sensitive fluorescence “turn-off” sensing of Fe3+ over a number of coexistent metal cations. 1 could also be used as a potential selective and sensitive probe