Neodymium(III) bromide explained

Neodymium(III) bromide is an inorganic salt of bromine and neodymium the formula NdBr₃. The anhydrous compound is an off-white to pale green solid at room temperature, with an orthorhombic PuBr₃-type crystal structure.^[1] The material is hygroscopic^[2] and forms a hexahydrate in water (NdBr₃· 6H₂O), similar to the related neodymium(III) chloride.^[3]

Preparation

The direct reaction of neodymium with bromine can create neodymium(III) bromide:

2Nd + 3Br₂ → 2NdBr₃

In the presence of carbon, neodymium(III) oxide reacts with carbon tetrabromide to produce neodymium(III) bromide.^[4]

Structure

Neodymium(III) bromide adopts the plutonium(III) bromide crystal structure.^[5] The neodymium ions are 8-coordinate and adopt a bicapped trigonal prismatic geometry. The neodymium–bromine bond lengths are 3.07 Å and 3.09 Å.^[6]

Related compounds

Neodymium(III) bromide forms compounds with hydrazine, such as NdBr₃·N₂H₄·2H₂O, which is a pink crystal that is soluble in water but insoluble in benzene, with d_20°C = 3.2376 g/cm³.^[7]

Notes and References

1. Peterson . J.R. . Heathman . S. . Benedict . U. . Energy dispersive X-ray diffraction analysis of NdBr3 at pressures up to 52 GPa . Journal of Alloys and Compounds . March 1993 . 193 . 1–2 . 306–308 . 10.1016/0925-8388(93)90380-6. 136411696 .
2. David R. Lide (Hrsg.): CRC Handbook of Chemistry and Physics. 90. Auflage. (Internet-Version: 2010), CRC Press/Taylor and Francis, Boca Raton, FL, Properties of the Elements and Inorganic Compounds, S. 4-77.
3. Web site: NEODYMIUM BROMIDE 13536-80-6. www.chemicalbook.com. 20 December 2016.
4. Borisov, G. K.; Krasnova, S. G.; Khrenova, R. I. Preparation of anhydrous bromides of some lanthanides. Zhurnal Neorganicheskoi Khimii, 1971. 16(22): 2899-2901.
5. Book: A. F. . Wells . Structural Inorganic Chemistry . 5th . 1984 . Oxford University Press . 978-0-19-965763-6 . 421 .
6. W. H. . Zachariasen . William Houlder Zachariasen . Crystal chemical studies of the 5f-series of elements. I. New structure types . . 1 . 5 . 265–268 . 1948 . 10.1107/S0365110X48000703 . 1948AcCry...1..265Z .
7. https://books.google.com/books?id=nR45AAAAIAAJ Izvestii︠a︡ vysshikh uchebnykh zavedeniĭ: Khimii︠a︡ i khimicheskai︠a︡ tekhnologii︠a︡, Tập 16,Số phát hành 1