Protactinium oxyhalides

Protactinium has a wealth of halides, with all PaX4 and PaXs known, also Pals. There are also several oxyhalides. 

During the past few years numerous new penta- and tetravalent protactinium halides and oxyhalides have been characterized, but of the. possible trivalent compounds only Pals been reported. The presently... 

Actinide halides and oxyhalides are known to form numerous complexes with oxygen and nitrogen donor ligands and the preparation and properties of such compounds have recently been reviewed (12, 13). Relatively few protactinium halide complexes are known, but this situation reflects the lack of research rather than a tendency not to form complexes. However, there is sufficient information available for certain ligands to permit a comparison with the behavior of other actinide halides, and to illustrate the similarities and differences observed with the tetrahalides of thorium to plutonium inclusive and, to a lesser extent, with the protactinium and uranium pentahalides. 

Bagnall, K. W., Brown, D., Easey, J. F., Preparation, crystallographic properties, and infrared spectra of quadrivalent oxyhalides of thorium, protactinium, uranium, and neptunium, J. Chem. Soc. A, (1968), 288-291. Cited on pages 235, 254. 

Fig. 20.10 Different coordination geonutries of three oxyhalide compounds of protactinium (a) PaOCl, (b) PaOBr, and (c) [ (C2Hi) N 2PaOCli. After refs 337, 304, and 345.)...

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