Design and characterization of organic and organometallic molecules for second order nonlinear optics

Synthesis, Characterisation and Molecular Hyperpolarisabilities of Pseudo‐Octahedral Hydrido(nitrile)iron(II) Complexes for Nonlinear Optics: X‐ray Structure of [Fe(H)(dppe)2(4‐NCC6H4NO2)][PF6]·CH2Cl2

“…The outer regions of this range was used to correct the HRS signal for multi-photon fluorescence, as described before. [4,10] A large photoluminescence background was only observed for one of the free ligands (L3, see Table 1), for which the luminescence signal, integrated over the central region of 6 nm, was about equal to the actual HRS signal. HRS measurements were performed in a rectangular fused silica cell containing a dilute solution of the compound in chloroform.…”

“…All hyperpolarisabilities were determined by internal reference relative to chloroform, [48] as described before. [4,10] Within the assumption of only one significant diagonal β tensor component along the z-axis (i.e. the conjugated backbone of the molecule), β zzz values can be calculated by measuring the HRS signal for a dilute solution with known concentration of the chromophores and from pure chloroform.…”

Highly sensitive setup for tunable wavelength hyper-Rayleigh scattering with parallel detection and calibration data for various solvents

“…Moreover, as correctly pointed out in reference [34], fluorescence signals are likely to contain much faster components (even shorter than 1 ps), which can not be excluded by electronic means. Hence, although the time-resolved techniques could be useful as an additional method to suppress MPF, the registration of a spectral range as is done in this work remains crucial to eliminate it reliably [32,36,[38][39][40]. The only mentioned drawback of this wavelength-dependent method to correct for fluorescence is that it would be time consuming [41].…”

Benzo[c]thiophene Chromophores Linked to Cationic Fe and Ru Derivatives for NLO Materials: Synthesis Characterization and Quadratic Hyperpolarizabilities

“…[1] During the last two decades, significant work has been published outlining the most important progress in the field. [2][3][4][5][6][7][8][9][10][11] According to the overall results, the general understanding is that second-order non-linearities are strongly related to asymmetric push-pull systems. In the case of organometallic compounds, the metal centre can be bound to a highly polarizable conjugated backbone, thereby acting as an electron-releasing or -withdrawing group.…”