TY - JOUR
T1 - Synthesis and luminescent properties of cis bis-N-heterocyclic carbene platinum(II) bis-arylacetylide complexes
AU - Zhang, Yuzhen
AU - Garg, Jai Anand
AU - Michelin, Clement
AU - Fox, Thomas
AU - Blacque, Olivier
AU - Venkatesan, Koushik
PY - 2011/2/21
Y1 - 2011/2/21
N2 - A series of luminescent N-heterocyclic carbene platinum(II) complexes, [(pmim)Pt(C≡C-R)2] (R = C6H5 (2), C 6H4OMe (3), C6H2(OMe)3 (4), C6H4NMe2 (5), C4H3S (6), C6H4C≡CC6H5 (7), 1-pyrenyl (8), and C6H4F (9)), were successfully synthesized using the precursor (pmim)PtI2, 1 (pmim = 1,1′-dipentyl-3,3′-methylene-diimidazoline-2,2′-diylidene). The X-ray crystal structures of 1, 4, 5, and 7 have been determined. These complexes showed long-lived emission in solution at room temperature. The emission origin of the complexes is tentatively assigned to be from triplet states of predominantly intraligand (IL) character with some mixing of metal-to-ligand charge-transfer (MLCT) character. TD-DFT and DFT calculations have been performed on most of the complexes to ascertain the nature of the excited state. Changes in the alkynyl ligands lead to a change in the absorption and emission maxima seen for these complexes in a potentially predictable way.
AB - A series of luminescent N-heterocyclic carbene platinum(II) complexes, [(pmim)Pt(C≡C-R)2] (R = C6H5 (2), C 6H4OMe (3), C6H2(OMe)3 (4), C6H4NMe2 (5), C4H3S (6), C6H4C≡CC6H5 (7), 1-pyrenyl (8), and C6H4F (9)), were successfully synthesized using the precursor (pmim)PtI2, 1 (pmim = 1,1′-dipentyl-3,3′-methylene-diimidazoline-2,2′-diylidene). The X-ray crystal structures of 1, 4, 5, and 7 have been determined. These complexes showed long-lived emission in solution at room temperature. The emission origin of the complexes is tentatively assigned to be from triplet states of predominantly intraligand (IL) character with some mixing of metal-to-ligand charge-transfer (MLCT) character. TD-DFT and DFT calculations have been performed on most of the complexes to ascertain the nature of the excited state. Changes in the alkynyl ligands lead to a change in the absorption and emission maxima seen for these complexes in a potentially predictable way.
UR - http://www.scopus.com/inward/record.url?scp=79951632191&partnerID=8YFLogxK
U2 - 10.1021/ic101632v
DO - 10.1021/ic101632v
M3 - Article
C2 - 21244032
AN - SCOPUS:79951632191
SN - 0020-1669
VL - 50
SP - 1220
EP - 1228
JO - Inorganic Chemistry
JF - Inorganic Chemistry
IS - 4
ER -