Zinc complexes luminescent

Blue luminescence of zinc complexes of pyridyl-containing complexes is an area of current interest.277 Design of blue luminescent materials is of relevance to display applications, as blue-light-emitting diodes, and to this end Che examined solution luminescence of zinc pyridylamine complexes.73,278 Che and co-workers studied the complex Zn40(7-azaindoyl)6 which has a blue emission at 433 nm in the solid state.279,280 In an attempt to improve on stability Wang et al. examined compounds with neutral 7-azaindole and an A-functionalized pyridyl derivative.281 In contrast with other metal complexes of the neutral 7-azaindole (32), Zn(7-azaindole)2(OAc)2 is a blue luminescent compound and a A-(2-pyridyl) 2-azaindole (33) and its complexes were also... 

Luminescence is observed from coordination complexes of first row transition metals less often than from complexes of second or third row metals. This is a result of the presence of low-energy ligand field (LF) states into which the excitation is funneled that can rapidly deactivate through either non-radiative pathways to the ground state or photo-reaction pathways to products. Recent reports relating to the luminescence of titanium," chromium", and zinc complexes provide examples of new emissive first row coordination compounds. 

The design and studies involving the ligand itself directly forming part of the diarylethene framework, which should possess a greater perturbation and interaction between the metal center and the photochromic moiety, were also reported recently. Luminescence modulation with these ligands has also been demonstrated. In a zinc complex... 

A number of workers have studied zinc tetraphenylporphyrin complexes, and an intensive study of the luminescence properties of [ZnTPP] has been reported.1180 [ZnTPP] is also used in the well-known synthetic leaf experiments.11806... 

When Nd or Yb complexes of a similar macrocycle are covalently linked to a palladium porphyrin complex, this sensitizes near-IR emission from the lanthanide, enhanced in the absence of oxygen and in the presence of a nucleic acid7 Another application of luminescence accompanies the terbium complex shown in (39) whose luminescence is enhanced by binding to zinc, and can therefore signal for that metal. " ... 

Room-temperature tetrahedral zinc(II) complexes with polycatenar pyrazole or bis(pyrazolyl)methane hgands show luminescence in the near ultraviolet and blue spectral regions (Figure 2.42). ° A broad, structureless emission band with a large Stokes shift was observed. The emission bands were found to red-shift with an increase in the number of... 

Figure 2.42 Luminescent mesomorphic tetrahedral zinc(II) complexes with poly-catenar pyrazole ligands (a) or bis(pyrazolyl)methane ligands (b)...

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