Beyond Single-Wavelength SHG Measurements: Spectrally-Resolved SHG Studies
of Tetraphosphonate Ester Coordination Polymers
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Abstract
Powder second-harmonic generation
(SHG) efficiencies are usually measured at single wavelengths. In
the present work, we provide a proof of concept of spectrally resolved
powder SHG measured for a newly obtained series of three non-centrosymmetric
coordination polymers (CPs). CPs are constructed from tetrahedral
linker–tetraphenylmethane-based tetraphosphonate octaethyl
ester and cobalt(II) ions of mixed, octahedral (<i>O</i><sub><i>h</i></sub>), and tetrahedral (<i>T</i><sub><i>d</i></sub>), geometries and different sets of
donors (CoO<sub>6</sub> vs CoX<sub>3</sub>O). Isostructurality of
the obtained materials allowed for the determination of anion-dependent
tunability of SHG optical spectra and their relationship with solid-state
absorption spectra
