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Pyridyl-substituted platinum acetylide complexes bind coinage metal cations, strongly influencing photoluminescence properties. Large counterions maintain the blue phosphorescence profile with large increases in radiative rate and quantum yield. 

Red-phosphorescent bis-cyclometalated iridium compounds with salicylaldimine, 2-picolinamide, and related ancillary ligand classes are described; the 2-picolinamide analogues exhibit multiple binding modes that influence photophysical properties. 

This perspective focuses on strategies to manipulate and optimize three key determinants of metal-based molecular photosensitizers – the absorption profile, the excited-state redox potentials, and the excited-state lifetime. 

Magnesium oxide (MgO) is a major component of the Earth’s mantle and is expected to play a similar role in the mantles of large rocky exoplanets. At extreme pressures, MgO transitions from the NaClB1 crystal structure to a CsClB2 structure, which may have implications for exoplanetary deep mantle dynamics. In this study, we constrain the phase diagram of MgO with laser-compression along the shock Hugoniot, with simultaneous measurements of crystal structure, density, pressure, and temperature. We identify theB1 toB2 phase transition between 397 and 425 gigapascal (around 9700 kelvin), in agreement with recent theory that accounts for phonon anharmonicity. From 425 to 493 gigapascal, we observe a mixed-phase region of B1 and B2 coexistence. The transformation follows the Watanabe-Tokonami-Morimoto mechanism. Our data are consistent withB2-liquid coexistence above 500 gigapascal and complete melting at 634 gigapascal. This study bridges the gap between previous theoretical and experimental studies, providing insights into the timescale of this phase transition.