Dipartimento di Chimica dell'Università degli Studi di Milano, UdR-INSTM, via Golgi 19, I-20133, Milano, Italy.
Dalton Trans. 2018 Dec 18;48(1):202-208. doi: 10.1039/c8dt03622e.
Five new platinum(ii) complexes bearing a cyclometallated 5-π-delocalized donor-1,3-di(2-pyridyl)benzene were prepared and fully characterized. Their second-order nonlinear optical (NLO) properties were determined by the Electric-Field Induced Second Harmonic generation (EFISH) technique, working in DMF solution with an incident wavelength of 1907 nm, whereas the dipole moments were determined by Density Functional Theory (DFT) calculations. Remarkably, the platinum(ii) complex with a cyclometallated 5-guaiazulene-CH[double bond, length as m-dash]CH-1,3-di(2-pyridyl)benzene appears as a very good candidate for application in photonics, being characterized by the largest second-order NLO response. Besides, it appeared that the nature of substituents on thiophene, chosen as π-delocalized moiety in position 5 of the 1,3-di(2-pyridyl)benzene, strongly affects the NLO properties.
五个新的含有环金属化的 5-π-离域给体-1,3-二(2-吡啶基)苯的铂(ii)配合物被制备并进行了充分的表征。它们的二阶非线性光学（NLO）性质通过电致二次谐波产生（EFISH）技术在 DMF 溶液中测定，激发波长为 1907nm，而偶极矩则通过密度泛函理论（DFT）计算来确定。值得注意的是，含有环金属化的 5-瓜环-CH[双键，长度为 m-dash]-CH-1,3-二(2-吡啶基)苯的铂(ii)配合物作为在光子学中应用的一个非常好的候选物，表现出最大的二阶 NLO 响应。此外，在 1,3-二(2-吡啶基)苯的 5 位上选择作为π-离域部分的噻吩上取代基的性质强烈影响 NLO 性质。
