The crystal structure of the nitric acid adducts of triphenylarsine oxide and triphenylphosphine oxide

Molecular dimensions suggest that three crystal forms of the nitric acid adduct of triphenylarsine oxide have the bridging proton more closely associated with the As=O group than with the nitrate moiety, whereas the corresponding phosphorus compound has the proton more closely associated with the nitrate moiety. In all cases, strong hydrogen bonds are formed between the two moieties resulting in X-O bonds (where X=As or P) intermediate in character between single and double bonds. (C) 1998 Elsevier Science Ltd. Ah rights reserved.