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rubidium phosphide is a compound formed by the reaction of rubidium atoms with phosphate ions. It has a formula of Rb2P2O5 and is a soft whitish-grey solid in the alkali metal group.
The cation (Rb) has a single electron in its outermost energy level, and the dihydrogen phosphate anion has a -1 charge. This means that you need to balance the charge by using a ratio of the two ions. This is done by comparing the ratio of the ions that have the same oxidation number in the valence shell.
Sodium phosphide is also a compound that has a cation of +1 and an anion of -1. This compound is also in the first column of the periodic table, so you need to use the roman numeral in parentheses to find the formula.
Zinc phosphide is another compound that has a cation of +2 and an anion of -1. This ionic compound has a formula of Rb2Zn2HPO4-.
It is a new crystalline material prepared by a novel technique that uses long nucleation times. The gel is placed in a sealed Pyrex flask at 52 degC and 4.5 months are needed to form crystals.
The crystallization of this compound occurs as a result of hydrogen bonds between the phosphorus atoms and the phosphate ions. These phosphorus atoms form a three-dimensional framework structure that is oriented from left to right. This is reflected in the morphology of the crystalline material. The OH polarity is also observed in the FT-IR spectra of the crystals as the P21/m peaks at 666 cm-1 and 864 cm-1 are attributed to n1 and n3(Te/P)O stretching vibrations, respectively.