ABAB-type Zn(II) phthalocyanines, crosswise-functionalized with two and four iodine atoms, respectively, have been efficiently prepared using statistical condensation procedures. Key to the selective preparation of the opposite ABAB isomers versus the adjacent AABB ones is the use of bulky 3,6-(3',5'-bis(trifluoromethyl)phenyl)phthalonitrile with hampered self-condensation capabilities.
We designed and synthesized as eries of novel electron-accepting zinc(II)phthalocyanines (ZnPc) and probed them in p-type dye sensitized solar cells (p-DSSCs) by using CuO as photocathodes.Byrealizing the right balance between interfacial charge separation and charge recombination, optimizedf ill factors (FFs) of 0.43 were obtained. With ac ontrol over fill factors in p-DSSCs in hand we turned our attemtion to t-DSSCs,inw hichwecombined for the first time CuO-based p-DSSCs with TiO 2 -based n-DSSCs using ZnPc and N719. In the resulting t-DSSCs,the V OC of 0.86 Visthe sum of those found in p-and n-DSSCs,w hile the FF remains around 0.63. It is only the smaller J sc sint-DSSCs that limits the efficiency to 0.69 %.
The panchromatic character, and cascade-like charge transfer behaviour of this multichromophoric conjugate, prove it a unique photosynthetic reaction center mimic.
An unprecedented FePc metallo-organic helicate has been assembled using a bidentate phthalocyanine (Pc) ligand, 2-formylpyridine and Fe(OTf). This giant helicate has proved itself as a host for large redox-active guests such as fullerene and naphthalenediimide derivatives. Photoactivated electronic interactions between components occur in the host-guest complex.
Unique donor–π–acceptor phthalocyanines have been synthesized through the asymmetric functionalization of an ABAB phthalocyanine, crosswise functionalized with two iodine atoms through Pd‐catalyzed cross‐coupling reactions with adequate electron‐donor and electron‐acceptor moieties. These push–pull molecules have been optically and electrochemically characterized, and their ability to perform as chromophores for dye‐sensitized solar cells has been tested.
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