Absorption and Raman spectroscopy of massselected tantalum tetramers in argon matricesAbsorption spectroscopy of massselected ions in neon matrices J. Chem. Phys. 90, 600 (1989); 10.1063/1.456461Twophoton absorption spectroscopy of massselected ions: N2O+ and CS+ 2
A direct band gap 2D corrugated layer lead chloride hybrid, [(CH3)4N]4Pb3Cl10 (1), shows analogous topology to the {Mg3F104−}∞ layer in Cs4Mg3F10, and with the (CH3)4N+ cations locating in the inorganic layer voids and between the interlayers. Two reversible structural phase transitions occur in 1 at 225/210 K and 328/325 K upon heating/cooling, respectively. On going from the low‐ to intermediate‐temperature phase, the space group changes from P21/c to Cmca, and the crystallographic axis perpendicular to the layers is doubled with the order–disorder transformation of (CH3)4N+ cations between the interlayers. The intermediate‐ and high‐temperature phases are isomorphic with similar cell parameters and packing structure; their main difference concerns the disorder degree of the (CH3)4N+ cations between the interlayers. The two‐step structural phase transitions lead to dielectric anomalies around the corresponding Tc. Interestingly, 1 shows multiband emission, originating from the recombination of exciton and emission of defects. Moreover, 1 exhibits divergent thermochromic luminescent features around the Tc on the intermediate to low temperature transition.
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