Tetrathiafulvalene-functionalized triptycenes: synthetic protocols and elucidation of intramolecular Coulomb repulsions in the oxidized species
摘要:
A large selection of triptycenes functionalized with tetrathiafulvalene (TTF) units as well as triptycenes containing extended TTFs as a part of the triptycene core have been synthesized utilizing new triptycene di- and tetraaldehydes as well as bis-, tetrakis- and hexakis(bromomethyl) derivatives. The largest scaffold contains a total of 12 TTFs around the central triptycene core. From spectroelectro-chemical and chemical oxidation studies, we have elucidated the extent to which an increasing number of electrostatic interactions among oxidized TTF units exert an influence on the absorption characteristics. (c) 2007 Elsevier Ltd. All rights reserved.
New metal–organic frameworks from triptycene: structural diversity from bulky bridges
作者:Angela K. Crane、Brian O. Patrick、Mark J. MacLachlan
DOI:10.1039/c3dt00079f
日期:——
Four distinct triptycene-containing metalâorganic frameworks, including three that are structural isomers, were synthesized and characterized. Structural isomerism was observed in the secondary building units of TMOF-2 giving rise to no fewer than three distinct [Zn4O]6+ clusters. Structural integrity upon guest solvent removal was confirmed using powder X-ray diffraction and thermogravimetric analysis, but gas adsorption experiments were conducted and revealed no appreciable surface area. Triptycenyl groups incorporated into MOFs appear to enhance structural diversity, but also crowd the pores of the MOF, reducing accessible surface area.
A PHOTOLYTIC ONE-STEP SYNTHESIS AND STEREOCHEMISTRY OF 1,4-DIMETHYL-9-ARYLFLUORENES
作者:Hiizu Iwamura
DOI:10.1246/cl.1974.1205
日期:1974.10.5
Photolysis of 2,5-dimethyltriptycene (3) in methanol gives 1,4-dimethyl-9-(2-substituted phenyl)fluorenes 1 and 2 in 89 and 5 % yields, respectively. The results are interpreted in terms of the regioselective formation of intermediate carbene 4. The temperature dependent NMR study gives a rough estimate of ΔGc≠ value for restricted rotation around the C(9)-aryl bond in 2 as 19.4 kcal/mol (104°C).