Permeability of a Seemingly Nonporous Crystal Formed by a Discrete Metallocyclic Complex
摘要:
We describe the structure and permeability of a crystalline material that appears to be nonporous in a conventional sense. The material is initially formed as a solvate, and removal of the solvent molecules under relatively mild conditions proceeds via a single-crystal to single-crystal transformation, leaving the host structure intact. Although discrete unoccupied voids of 108 A3 are present in the structure, it is not possible to map open channels that represent an intuitive pathway for guest diffusion. Despite the apparent absence of pores, the material is permeable to a variety of gases including H2, O2, N2, CO, CH4, CO2, and I2. These findings show that porosity in crystalline systems cannot always be rationalized by considering the static structures and that as-yet unknown dynamic and cooperative mechanisms prevail by which porosity can be induced.
Using a metal–ligand coordination bonding approach, the self-assembly of four new metallamacrocycles fromPd(II)-based 90° acceptors and a diimidazole donor ligand 1,3-bis(imidazole-1-ylmethyl)-2,4,6-trimethylbenzene (L) has been achieved. The assemblies are characterized fully by NMR and electrospray ionization-mass spectroscopic (ESI-MS) analysis and in two cases the X-ray single-crystal structure
Assembly of a twin-cage complex containing a linear array of Pd3 †
作者:Hong-Ke Liu、Cheng-yong Su、Cheng-Ming Qian、Jun Liu、Hai-Yan Tan、Bei-Sheng Kang
DOI:10.1039/b101691l
日期:——
The M3L4 twin-cage complex [Pd3(bitmb)4Cl4]Cl2·2H2O·CH3CN [bitmb = 1,3-bis(imidazol-1-ylmethyl)-2,4,6-trimethylbenzene] was obtained by assembly of three Pd(II) ions with four molecules of the new flexible ditoptic ligand bitmb; structural analysis showed that the complex contains two M2L2 cages with a cavity size of ca. 200 Å3.
Ag(I)-N-heterocyclic carbene complexes of N-allyl substituted imidazol-2-ylidenes with ortho-, meta- and para-xylyl spacers: Synthesis, crystal structures and in vitro anticancer studies
作者:Rosenani A. Haque、Mohammed Z. Ghdhayeb、Abbas Washeel Salman、Srinivasa Budagumpi、Mohamed B. Khadeer Ahamed、Amin M.S. Abdul Majid
DOI:10.1016/j.inoche.2012.05.037
日期:2012.8
xylyl-linked imidazolium salts (7–10) and their respective Ag(I)-N-heterocycliccarbene (NHC) complexes (11–14) have been synthesized and characterized by a number of spectral and analytical techniques. Molecular structure of complexes 13 and 14 were established by single‐crystal X-ray diffraction method. The in vitro anticancer activity of all imidazolium salts and their Ag(I)-carbene complexes were investigated
Three ternary coordination polymers (CPs), namely, [Cd2(BrIP)2(BITMB)(H2O)2]·(THF)2·H2O}n (CP1), [Cu(BrIP)(BITMB)(H2O)]n (CP2), [Ni(BrIP)(BITMB)(H2O)]·(THF)(H2O)2}n (CP3) were synthesized by solvothermal reactions between H2BrIP (5-bromoisophthalate), BITMB (1,3-bis(imidazol-1-ylmethyl)-2,4,6-trimethylbenzene) and respective metal nitrates. Single crystal X-ray diffraction studies reveal a variety of supramolecular interactions such as inter/intra molecular hydrogen bonding, C–H⋯π, and π⋯π stacking in the 1D interwoven metal organic triple helical motifs of CP1 and sql networks of CP2 and CP3. Solvents employed for the synthesis of these CPs may be acting as structure directing agents. The photocatalytic properties of all three CPs, for the decomposition of Metanil Yellow by dilute hydrogen peroxide in the presence of visible light, have been evaluated and up to 89% dye removal from aqueous solution was achieved in the case of CP2. Solid state fluorescence studies disclose the promising luminescence properties of synthesized CPs.
Threading the needle: guest transport in a versatile 0D porous molecular crystal
作者:Varvara I. Nikolayenko、Anneli Heyns、Leonard J. Barbour
DOI:10.1039/c7cc06676g
日期:——
Porous host crystals of the metallocycle [Cu2(1,3-bis(imidazol-1-ylmethyl)-2,4,6-trimethylbenzene)2Cl4]·2CH3OH are permeable to a series of small organic guests despite their lack of permanent channels.