in applications such as chemosensing or organocatalysis. In this account, we describe strategies for the linking of BINOL units via the 3-, 4-, or 5-positions, showing that unique synthetic strategies are necessary to address each position. We report the synthesis of suitable C 1-symmetric precursors, which are generated either by monohalogenation or by monodeprotection of C 2-symmetric starting materials
Rigidly Tethered Bis-phosphoric Acids: Generation of Tunable Chiral Fluorescent Frameworks and Unexpected Selectivity for the Detection of Ferric Ions
作者:Frescilia Octa-Smolin、Raja Mitra、Maike Thiele、Constantin G. Daniliuc、Linda Stegemann、Cristian Strassert、Jochen Niemeyer
DOI:10.1002/chem.201700954
日期:2017.7.26
We describe the straightforward synthesis of a series of bis-phosphoric acids (R,R)-1 a–d, featuring two chiral 1,1′-binaphthyl-phosphoric acid units that are tethered by rigid, π-conjugated linkers. The nature of the linker has a profound influence on the properties of the bis-phosphoric acids, such as their self-association behavior and their interaction with metal ions. This led to the identification
我们描述了一系列双磷酸(R,R)-1 a – d的简单合成,其特征是两个手性1,1'-联萘基磷酸单元被刚性的π-共轭连接物束缚。接头的性质对双磷酸的性质具有深远的影响,例如它们的自缔合行为以及它们与金属离子的相互作用。这导致鉴定出一种优选的双磷酸(R,R)-1 d,其在三价铁离子(Fe 3+)存在下显示出选择性的荧光猝灭。因此,(R,R)-1 d即使存在多种其他金属离子,也可用于检测Fe 3+。双磷酸的手性使CD 3+能与Fe 3+相互作用,从而用相同的探针提供了互补的检测模式。
Disclosed herein are low dielectric constant (low-k) two-dimensional covalent organic framework materials that have a dielectric constantkless than 2.4, optionally less than 1.9, and are comprised of regularly porous, covalently linked, layer structures.
A 2D Covalent Organic Framework with 4.7-nm Pores and Insight into Its Interlayer Stacking
作者:Eric L. Spitler、Brian T. Koo、Jennifer L. Novotney、John W. Colson、Fernando J. Uribe-Romo、Gregory D. Gutierrez、Paulette Clancy、William R. Dichtel
DOI:10.1021/ja206242v
日期:2011.12.7
Two-dimensional layered covalentorganicframeworks (2D COFs) organize π-electron systems into ordered structures ideal for exciton and charge transport and exhibit permanent porosity available for subsequent functionalization. A 2D COF with the largest pores reported to date was synthesized by condensing 2,3,6,7,10,11-hexahydroxytriphenylene (HHTP) and 4,4'-diphenylbutadiynebis(boronic acid) (DPB)
Lattice Expansion of Highly Oriented 2D Phthalocyanine Covalent Organic Framework Films
作者:Eric L. Spitler、John W. Colson、Fernando J. Uribe-Romo、Arthur R. Woll、Marissa R. Giovino、Abraham Saldivar、William R. Dichtel
DOI:10.1002/anie.201107070
日期:2012.3.12
Expanding into application: Covalentorganicframework (COF) films are ideally suited for vertical charge transport and serve as precursors of ordered heterojunctions. Their pores, however, were previously too small to accommodate continuous networks of complementary electron acceptors. Four phthalocyanine COFs with increased pore size well into the mesoporous regime are now described (see picture)