2,2,7,7,12,12,17,17-Octamethyl-21,22,23,24-tetrathia-2,7,12,17-tetragermapentacyclo[16.2.1.13,6.18,11.113,16]tetracosa-3,5,8,10,13,15,18,20-octaene
نویسندگان
چکیده
The title compound, [Ge4(CH3)8(C4H2S)4], crystallizes with one-half mol-ecule in the asymmetric unit, the whole mol-ecule being generated by inversion symmetry. The dihedral angle between adjacent thio-phene rings is 72.84 (14)°. In the crystal, mol-ecules are linked by C-H⋯π inter-actions, leading to the formation of chains along [100].
منابع مشابه
Dual fluorescence in 9-amino-2,7,12,17-tetraphenylporphycene.
The absorption spectrum of the asymmetric 9-amino-2,7,12,17-tetraphenylporphycene shows new, strongly red-shifted bands compared to the symmetric parental 2,7,12,17-tetraphenylporphycene and to the also asymmetric 9-acetoxy-2,7,12,17-tetraphenylporphycene. Dual emission is also observed with relative contributions that depend strongly on the excitation wavelength and temperature. The gap betwee...
متن کاملTautomerization in 2,7,12,17-tetraphenylporphycene and 9-amino-2,7,12,17-tetraphenylporphycene: influence of asymmetry on the direction of the transition moment.
Femtosecond transient absorption anisotropy studies have been performed for two porphycenes of different symmetry. In 2,7,12,17-tetraphenylporphycene, the chemical identity of two trans forms implies a change in the S(0)-S(1) transition-moment direction upon tautomerization. Exploiting this phenomenon, the rates of double hydrogen transfer in both the S(0) and S(1) states (1.4×10(12) s(-1) and...
متن کاملPhotochemical production and characterisation of the radical ions of tetraphenylporphycenes.
Both the radical anion and radical cation of 2,7,12,17-tetraphenylporphycene and of its palladium(II) complex have been produced by photochemical methods. Their electronic absorption spectrum and decay kinetics have been characterised by global analysis of the time-absorbance-wavelength matrix. The results provide deeper insight on the role of these radical ion species in the photodynamic activ...
متن کاملGround and excited state double hydrogen transfer in symmetric and asymmetric potentials: comparison of 2,7,12,17-tetra-n-propylporphycene with 9-acetoxy-2,7,12,17-tetra-n-propylporphycene.
Analysis of time-resolved anisotropy of transient absorption enabled determination of room temperature ground and excited state rate constants for intramolecular double hydrogen transfer in two similar porphycenes, one of them with symmetric and the other, with asymmetric character of a double minimum potential for hydrogen motion. The perturbation preserves a quasi-symmetric minimum in S(0), b...
متن کامل8,11,24-Trioxa-21-thia-19-azapentacyclo[16.6.0.02,7.012,17.019,23]tetracosa-2(7),3,5,12,14,16-hexaene
In the title compound, C19H19NO3S, the thia-zole and oxazolidine rings each adopt an envelope conformation, with the S and O atoms as the respective flap atoms. The thia-zole and oxazolidine rings (all atoms) make a dihedral angle of 66.39 (11)° while the phenyl rings subtend a dihedral angle of 22.71 (10)°.
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عنوان ژورنال:
دوره 69 شماره
صفحات -
تاریخ انتشار 2013