Preparation, properties, and structure refinement of the stacking variant 2-MnP4

Structural Diversity and Electronic Properties of 3d Transition Metal Tetraphosphides, TMP4 (TM = V, Cr, Mn, and Fe)

“…As listed in Table , 6-MnP 4 and γ-FeP 4 show the lowest formation enthalpy (Δ E f = 0) among different configurations of MnP 4 and FeP 4 , respectively . Moreover, the phase formation of 6-MnP 4 , 8-MnP 4 , and 2-MnP 4 is very competitive during synthesis due to small energy difference within 10 meV/fu, in good agreement with previous experiment observations. − For γ-MnP 4 , the metastable nature is revealed by its formation enthalpy, higher than that of 6-MnP 4 by 36 meV/fu; this agrees well with the high annealing temperature (923–1073 K) during synthesis, and it is difficult to separate from the mixture of manganese tetraphosphides . For iron tetraphosphide (FeP 4 ), the formation enthalpy of α-FeP 4 is close to that of γ-FeP 4 (higher by about 11 meV/fu), whereas β-FeP 4 is higher than γ-FeP 4 by about 64 meV/fu, agreeing with the synthesis at high temperature and high pressure conditions (1373 K and 6 GPa) for β-FeP 4 .…”

“…CrP 4 was first synthesized by reaction of the constituent elements at pressure of 1.5–6.5 GPa about half century ago . Later on, 3d transition-metal tetraphosphides (TMP 4 ) of VP 4 , MnP 4 , − and FeP 4 − were prepared by high pressure or chemical transport with iodine or bromine at high temperature. The 3d TMP 4 compounds crystallize in different crystal symmetry with covalent phosphorus networks, where the cavities or channels may facilitate the migration of lithium ion.…”

Crystal and molecular structures of bis(4,4',6,6'-tetramethyl-2,2'-bipyridyl)copper(I) perchlorate, bis(4,4',6,6'-tetramethyl-2,2'-bipyridyl)copper(II) diperchlorate, and bis(4,4',6,6'-tetramethyl-2,2'-bipyridyl)copper(II) diperchlorate dihydrate. A search for copper(II) and copper(I) complexes with a common ligand environment

“…The diaquo cation [Cu(bpy)2(H20)2]2+ is said to exist in aqueous solution28 and is believed to have a cis configuration.29 However, to our knowledge only one bis(2,2'-bipyridyl)copper(II) complex has been found to con-tain a coordinated water molecule in the crystal. 25 Conclusions Bis(bipyridine) complexes with bulky substituents in the 6and 6'-positions have appeared to offer some promise for giving pseudotetrahedral complexes of both copper(I) and copper(II). And in fact, on the basis of visible and IR spectra as well as conductometric measurements in nitrobenzene, a pseudotetrahedral structure has been considered likely for the copper complex in Cu(tmbp)2(C104)2.13 As we have shown, however, this is not the case in the solid state, where the coordination geometry is in fact based on a trigonal bipyramid with a coordinated perchlorate anion.…”

Synthesis, Characterization, and Properties of Metal Phosphide Catalysts for the Hydrogen-Evolution Reaction

“…In many instances, the flux method yields high-quality phosphide crystals (Figure ) and provides access to metastable and low-temperature phases that are inaccessible by the use of higher-temperature solid-state reactions, which tend to favor the formation of more thermodynamically stable products. Moreover, phosphide phases like CrP 4 , MnP 4 , , and Re 2 P 5 are challenging to obtain through alternative methods without the use of high pressures.…”