A new series of luminescent phosphine stabilised platinum ethynyl complexes.
A series of cis-platinum ethynyl complexes with the general formula cis-[Pt(dppe)(C[triple bond]CR)2](dppe = 1,2-bis(diphenylphosphino)ethane; R = C6H4-p-NO2 1, C6H4-p-CH3 2, C6H4-p-C[triple bond]CH 3 and C6H4-p-C6H4-p-C[triple bond]CH 4) have been prepared by the coupling reaction of cis-[Pt(dppe)Cl2] with two equivalents of the appropriate alkyne. The new complexes have been fully characterized by spectroscopic techniques, and the cis square planar arrangement at the platinum centre has been confirmed by single-crystal X-ray diffraction studies of complexes 1, 2 and 4. The absorption spectra of the complexes 1-4 are dominated by a pi-->pi* band that contains some platinum (n + 1) p orbital character. The position of the band is dependent on the electron donating or withdrawing properties of the ethynyl substituents, R. Complex 1 displays a triplet emission in the green, at room temperature, while complexes 2-4, display singlet emissions in the blue. Again, the difference can be attributed to the nature of the R substituents.
Saha
Ramkrishna
R
Department of Chemistry, Shahjalal University of Science and Technology, Sylhet 3114, Bangladesh.
Qaium
Md Abdul
MA
Debnath
Dipen
D
Younus
Muhammad
M
Chawdhury
Nazia
N
Sultana
Nasim
N
Kociok-Köhn
Gabriele
G
Ooi
Li-Ling
LL
Raithby
Paul R
PR
Kijima
Masashi
M
D000480:Alkynes / Q000737:chemistry*; D018360:Crystallography, X-Ray; D049449:Luminescence; D008958:Models, Molecular; D015394:Molecular Structure; D009944:Organoplatinum Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D010720:Phosphines / Q000737:chemistry*; D012680:Sensitivity and Specificity; D013056:Spectrophotometry, Ultraviolet / Q000379:methods
D000480:Alkynes; D009944:Organoplatinum Compounds; D010720:Phosphines; C044646:phosphine