Phosphorus monosulfide

Hydrogen is located on the far left of the periodic table, but it s actually a nonmetal. In keeping with this hydrogenic craziness, hydrogen can appear as either the first or second element in a binary (two-element) molecular compound, as shown by dihydrogen monosulfide (H2S) and phosphorus trihydride (PH3). 

The monosulfides of Ge, Sn and Pb are all obtained by precipitation from aqueous media. Both GeS and SnS crystallize with layer structures similar to that of black phosphorus (see Section 14.4). Lead(II) sulfide occurs naturally as galena and adopts an NaCl lattice. Its formation as a black precipitate ( p 10 ) is observed in the quaUtative test for H2S (equation 13.70). The colour and very low solubility of PbS suggest that it is not a purely ionic compound. 

Reactions of Ru3(GO)i2 with the chiral diphosphazane monoselenide Ph2PN(R)P(Se)Ph2 (R = (triruthenium cluster Ru3(/i3-Se)(/i-GO)(GO)7 /i-PPh2N((analogous reaction of the diphosphazane monosulfide (PhO)2PN(Me)P(S)(OPh)2 that bears a strong vr-acceptor phosphorus shows a different reactivity pattern yielding the triruthenium clusters... 

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