Ester formation at the liquid-solid interface.

A chemical reaction (esterification) within a molecular monolayer at the liquid-solid interface without any catalyst was studied using ambient scanning tunneling microscopy. The monolayer consisted of a regular array of two species, an organic acid (trimesic acid) and an alcohol (undecan-1-ol or decan-1-ol), coadsorbed out of a solution of the acid within the alcohol at the interface of highly oriented pyrolytic graphite (HOPG) (0001) substrate. The monoester was observed promptly after reaching a threshold either related to the increased packing density of the adsorbate layer (which can be controlled by the concentration of the trimesic acid within the alcoholic solution via sonication or extended stirring) or by reaching a threshold with regards to the deposition temperature.

(Metallo)porphyrins for potential materials science applications.

The bottom-up approach to replace existing devices by molecular-based systems is a subject that attracts permanently increasing interest. Molecular-based devices offer not only to miniaturize the device further, but also to benefit from advanced functionalities of deposited molecules. Furthermore, the molecules itself can be tailored to allow via their self-assembly the potential fabrication of devices with an application potential, which is still unforeseeable at this time.

Synthesis, spectroscopic characterization and thermogravimetric analysis of two series of substituted (metallo)tetraphenylporphyrins.

Subsequent treatment of HTPP(COH) (tetra(-carboxylic acid phenyl)porphyrin, ) with an excess of oxalyl chloride and HNR afforded HTPP(C(O)NR) (R = Me, ; iPr, ) with yields exceeding 80%. The porphyrins and could be converted to the corresponding metalloporphyrins MTPP(C(O)NR) (R = Me/iPr for M = Zn (, ); Cu (, ); Ni (, ); Co (, )) by the addition of 3 equiv of anhydrous MCl (M = Zn, Cu, Ni, Co) to dimethylformamide solutions of and at elevated temperatures. Metalloporphyrins - and - were obtained in yields exceeding 60% and have been, as well as and , characterized by elemental analysis, electrospray ionization mass spectrometry (ESIMS) and IR and UV-vis spectroscopy.