Porphyrins bearing uracyl motifs at the four meso positions self-organize via homo-complementary hydrogen bonds and π-stacking into nanofibers, nanorods and thin films on mica and glass surfaces depending on deposition conditions.
Articles you may be interested inLow-lying electronic states of the Ti 2 dimer: Electronic absorption spectroscopy in rare gas matrices in concert with quantum chemical calculations
Raman and absorption spectrum of mass-selected lutetium dimers in argon matricesWe examine the resonance Raman spectroscopy of the heteronuclear dimers VCo and VFe, using a mass-selected cluster source. Cluster cations are produced in a sputtering source and mass filtered with a Wien filter, then neutralized and deposited in an Ar matrix at low temperatures. For VCo we obtain the resonance Raman spectra in Ar matrix excited with 457.9, 488.0, 496.5, 501.7, and 514.5 nm laser lines. We observe Raman shifts of 459 and 916 cm Ϫ1 , and we assign these lines to the fundamental and first overtone of the ground state. The resulting force constant is k e ϭ3.42 mdyne/Å. Resonance Raman spectra of VFe, obtained at the same five excitation wavelengths, display Raman shifts at 423 and 836 cm Ϫ1 , and we assign these to the fundamental and first overtone of the ground-state vibration. The resulting force constant is k e ϭ2.94 mdyne/Å. We compare these observed force constants and configurations with those of other V-X dimers ͑XϭTi-Ni͒, as well as related isoelectronic species. The value for VFe, with 13 valence electrons, is considerably lower than its neighbors. This molecule most likely has a 2 ⌺ ϩ ground state, stemming from a (3d) 2 (3d) 4 (3d␦) 4 (4s) 2 (4s*) 1 configuration. The higher force constant for VCo with 14 valence electrons indicates either a (3d) 2 (3d) 4 (3d␦) 4 (3d␦*) 2 (4s) 2 configuration with a 3 ⌺ state, or a (3d) 2 (3d) 4 (3d␦) 4 (3d␦*) 1 (4s) 2 (4s*) 1 configuration with a 3 ⌬ state.
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