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

Compromise between conjugation length and charge-transfer in nonlinear optical η5-monocyclopentadienyliron(II) complexes with substituted oligo-thiophene nitrile ligands: Synthesis, electrochemical studies and first hyperpolarizabilities

“…Indeed, note that if a spectral component at shorter k eg value was selected, b values at 1.072 lm would be even more resonant for 1a and less resonant for 2a and 3a. Possibly, the discrepancy is caused by a red shift between the b dispersion and the linear absorption maximum, as reported for an organic chromophore [32] and also observed in wavelength dependent HRS for an iron nitrile complex [33]. Because the behaviour of b in the resonance regime is not well understood, measurements outside of this region are required in order to formulate dependable structure-NLO properties relationships.…”

“…The scattered second-harmonic light is analyzed with a monochromator, in addition to electronic gating within a 4 ns time window in order to discriminate efficiently between hyper-Rayleigh scattering and (two-photon) luminescence. For the measurements at 1.550 lm a recently developed HRS-setup [33] is used, based on an optical parametrical amplifier (OPA) pumped by a Ti:Sapphire regenerative amplifier, and with singlephoton sensitive, parallel detection of a small spectral range around the second-harmonic wavelength. With this setup, measurements were also performed at 1.072 lm, reproducing the 1.064 lm b values to within the experimental error of 5%.…”

Fe–H/D stretching and bending modes in nuclear resonant vibrational, Raman and infrared spectroscopies: Comparisons of density functional theory and experiment

“…The analysis of hydride modes in iron-hydride complexes similar to this one has a long history 14,19–22. In similar compounds, the Fe–H stretching frequency ranges from 1800 to 2000 cm −1 , and Fe–H distances from 1.4 to 1.6 Å.…”

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].…”