Impact of the Subunit Arrangement on the Nonlinear Absorption Properties of Organometallic Complexes with Ruthenium(II) σ-Acetylide and Benzothiadiazole as Building Units §

Inorganics

Eleonora Garoni¹  Claudia Dragonetti¹  Dominique Roberto¹  Alessia Colombo¹  Kenji Kamada² 

[1] Department of Chemistry, Università degli Studi di Milano, UdR dell’INSTM, Via Golgi 19, 20133 Milano, Italy;Inorganic Functional Materials Research Institute (IFMRI), National Institute of Advanced Industrial Science and Technology (AIST), Ikeda, Osaka 563-8577, Japan;

关键词: third-order nonlinearity;    two-photon absorption;    Ru complex;    benzothiadiazole;    Z-scan;   

DOI  :  10.3390/inorganics7050067

来源: DOAJ

【 摘 要 】

In this paper, the nonlinear absorption properties of two complexes consisting of Ru(C≡CPh)(C≡C)(dppe)₂ (dppe = Ph₂PCH₂CH₂PPh₂) as electron donor (D) and 4,7-di(2-thienyl)benzo[c][1,2,5]thiadiazole as electron acceptor (A) units in two different arrangement, i.e., A−D−A and D−A−D, are presented. They were measured in solution by the femtosecond open-aperture Z-scan method. The complexes show moderate two-photon absorption cross-sections σ⁽²⁾ of several hundred to one thousand GM (here 1 GM = 10⁻⁵⁰ cm⁴ s molecule⁻¹ photon⁻¹). Although they are formed by the same building units, it was found that the two-photon absorption values of the D−A−D arrangement are six times higher than that of the A−D−A one. This difference can be explained by the number of metal cores (one or two ruthenium centers), the geometrical configurations of the complexes (more or less planar), and the resonance enhancement by lowering the intermediate state.

【 授权许可】

Unknown