19057-50-2Relevant articles and documents
Highly Efficient and Reversible Iodine Capture in Hexaphenylbenzene-Based Conjugated Microporous Polymers
Liao, Yaozu,Weber, Jens,Mills, Benjamin M.,Ren, Zihao,Faul, Charl F. J.
, p. 6322 - 6333 (2016)
The effective and safe capture and storage of radioactive iodine (129I or 131I) is of significant importance during nuclear waste storage and nuclear energy generation. Here we present detailed evidence of highly efficient and reversible iodine capture in hexaphenylbenzene-based conjugated microporous polymers (HCMPs), synthesized via Buchwald-Hartwig (BH) cross-coupling of a hexakis(4-bromophenyl)benzene (HBB) core and aryl diamine linkers. The HCMPs present moderate surface areas up to 430 m2 g-1, with narrow pore size distribution and uniform ultramicropore sizes of less than 1 nm. Porous properties are controlled by the strut lengths and rigidities of linkers, while porosity and uptake properties can be tuned by changing the oxidation state of the HCMPs. The presence of a high number of amine functional groups combined with microporosity provides the HCMPs with extremely high iodine affinity with uptake capacities up to 336 wt %, which is to the best of our knowledge the highest reported to date. Two ways to release the adsorbed iodine were explored: either slow release into ethanol or quick release upon heating (with a high degree of control). Spectral studies indicate that the combination of microporosity, amine functionality, and abundant π-electrons ensured well-defined host-guest interactions and controlled uptake of iodine. In addition, the HCMPs could be recycled while maintaining 90% iodine uptake capacity (up to 295%). We envisage wider application of these materials in the facile uptake and removal of unwanted oxidants from the environment.
The Versatile Synthesis and Self-Assembly of Star-Type Hexabenzocoronenes
Wu, Jishan,Watson, Mark D.,Muellen, Klaus
, p. 5329 - 5333 (2003)
An insoluble disclike building block hexa(4-iodophenyl)-peri-hexabenzocoronene (see picture) was synthesized in an efficient way, and subsequent functionalization led to a series of soluble, star-type hexabenzocoronenes (HBCs), all showing remarkable self-assembly behavior: 1) highly ordered liquid-crystalline materials, 2) dendronized HBCs, and 3) triarylamine-substituted HBCs.
7-Azaindolyl- and 2,2′-dipyridylamino-functionalized molecular stars with sixfold symmetry: Self-assembly, luminescence, and coordination compounds
Jia, Wen-Li,Wang, Rui-Yao,Song, Datong,Ball, Steven J.,McLean, Alastair B.,Wang, Suning
, p. 832 - 842 (2005)
Two novel star molecules functionalized with 7-azaindolyl and 2,2′-dipyridylamino groups have been synthesized. Both molecules possess a sixfold rotation symmetry. Molecule L1 is based on the hexaphenylbenzene core with the formula of hexa[p-(7-azaindolyl)phenyl]benzene, while molecule L2 is based on the hexakis(biphenyl)benzene core with the formula of hexa[p-(2,2′-dipyridylamino)biphenyl]benzene. Both compounds have been characterized by single-crystal X-ray diffraction analyses. Molecule L1 forms extended two-dimensional layered structure, while L2 forms interpenetrating columnar stacks in the solid state, as revealed by X-ray diffraction analyses. Nanowire structures based on columnar stacks through self-assembly of L2 on a graphite surface were revealed by an STM study. Molecules L1 and L2 are capable of binding to metal ions, resulting in unusual structural motifs. Two Ag 1 complexes with the formulae of [(AgNO3)2(L1) (1) and [(AgNO3)3(L1) (2) were isolated from the reactions of AgNO3 with L1. Compound 1 displays extended intermolecular π-π stacking interactions that are responsible for its extended two-dimensional structure in the crystal lattice, Complex 2 has a bowl shape and forms polar stacks in the crystal lattice. A Cu II complex with the formula of [{Cu(NO3)2} 6(L2) (3) was isolated from the reaction of Cu(NO3) 2 with compound L2. The six CuII ions in 3 are chelated by the 2,2′-dipyridylamino groups of the star ligand L2. Intermolecular Cu-O (nitrate) bonds lead to the formation of an extended two-dimensional coordination network of 3. Both L1 and L2 are blue luminescent. Their interactions with AgI or CuII cause drastic quenching of emission. In addition, the luminescence of L1 and L2 is sensitive to the presence of protons, which cause a reduction of emission intensity and a red shift of the emission energy.
Multiexcitonic Triplet Pair Generation in Oligoacene Dendrimers as Amorphous Solid-State Miniatures
Chi, Chunyan,Hong, Yongseok,Kim, Dongho,Kim, Hyungjun,Kim, Juno,Oh, Juwon,Teo, Hao Ting
supporting information, p. 20956 - 20964 (2020/08/24)
Singlet fission in organic semiconducting materials has attracted great attention for the potential application in photovoltaic devices. Research interests have been concentrated on identifying working mechanisms of coherent SF processes in crystalline so
Structural complexity induced by topology change in hybrids consisting of hexa-: Peri -hexabenzocoronene and polyhedral oligomeric silsesquioxane
Zhang, Meng-Yao,Zhou, Sheng,Pan, Hong-Bing,Ping, Jing,Zhang, Wei,Fan, Xing-He,Shen, Zhihao
supporting information, p. 8679 - 8682 (2017/08/09)
Organic-inorganic hybrids with hexa-peri-hexabenzocoronene (HBC) and polyhedral oligomeric silsesquioxane (POSS) were designed and synthesized. The increase of the POSS content (or a change in topology) results in more complex self-assembled structures. This work provides a new approach for the design and synthesis of materials with sub-10 nm sizes.
