| Title | Visible and Near-IR Emissions from k(2) N- and k(3) N-Terpyridine Rhenium(I) Assemblies Obtained by an [n×1] Head-to-Tail Bonding Strategy. |
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| Authors | Laramée-Milette, B.; Zaccheroni, N.; Palomba, F.; Hanan, G.S. |
| Journal | Chemistry |
| DOI | 10.1002/chem.201700077 |
| Abstract |
An [n×1] head-to-tail bonding strategy has been used for the synthesis of Re(I) metallacycles. From a k(3) N-dicarbonyl precursor, a single discrete [4×1] square assembly was isolated and characterized, whereas a k(2) N-tricarbonyl precursor led to two major species, a square and a [3×1] triangular assembly. Solid-state X-ray diffraction study has confirmed the high angular distortion (71° to 96°) of the k(2) N precursors. The electrochemical reversibility of the triangular (5) and square (6, 7) assemblies is increased with respect to that of their precursors. Photophysical investigation has confirmed pronounced red-shifts in the emissions of the k(3) N-dicarbonyl species 4 (935 nm) and 7 (980 nm), as confirmed by density functional theory (DFT) and time-dependent DFT (TD-DFT) calculations. |
See more Rhenium products. Rhenium (atomic symbol: Re, atomic number: 75) is a Block D, Group 7, Period 6 element with an atomic weight of 186.207. The number of electrons in each of rhenium's shells is 2, 8, 18, 32, 13, 2 and its electron configuration is [Xe] 4f14 5d5 6s2. 
The rhenium atom has a radius of 137 pm and a Van der Waals radius of 217 pm. Rhenium was discovered and first isolated by Masataka Ogawa in 1908. In its elemental form, rhenium has a silvery-white appearance. Rhenium is the fourth densest element exceeded only by platinum, iridium, and osmium. Rhenium's high melting point is exceeded only by those of tungsten and carbon.
Rhenium is found in small amounts in gadolinite and molybdenite. It is usually extracted from the flue dusts of molybdenum smelters. The name Rhenium originates from the Latin word 'Rhenus' meaning "Rhine" after the place of discovery.