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Photosensitizing Properties of Alkynylrhenium(I) Complexes [Re(–C≡C–R)(CO) 3 (N∩N)] (N∩N = 2,2′‐bipy, phen) for H 2 Production
Author(s) -
Oberholzer Miriam,
Probst Benjamin,
Bernasconi Dominik,
Spingler Bernhard,
Alberto Roger
Publication year - 2014
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201402142
Subject(s) - chemistry , diimine , pyridine , cationic polymerization , acetylene , hydroamination , medicinal chemistry , catalysis , acetylide , halide , spectroscopy , photochemistry , alkyne , stereochemistry , polymer chemistry , inorganic chemistry , organic chemistry , physics , quantum mechanics
A series of complexes of the type [ fac ‐Re(X)(CO) 3 (N∩N)] (X = –C≡C–R, N∩N = 2,2′‐bipy, 2,2′‐phen) were synthesized and fully characterized. Their photophysical characteristics make them very convenient photosensitizers (PSs). Upon light irradiation, H 2 formation was observed for all alkynyl complexes in the presence of a water‐reducing catalyst (WRC) and a sacrificial electron donor. Relative rates of H 2 production indicate a dependency upon the diimine ligands rather than upon the nature of the σ‐bonded alkynyl derivatives. The coordinated acetylene group induces a redshift of the λ max of the MLCT band in UV/Vis spectroscopy as compared to those of the corresponding halides, nitriles, or cationic Re I complexes, such as [ fac ‐ReX(CO) 3 (N∩N)] (X = pyridine, H 2 O, N∩N = bipy, phen).