User:Praseodymium-141/Neodymium/Compounds

Compounds[edit]

Some of the most important neodymium compounds include:

halides: NdF₃; NdCl₂; NdCl₃; NdBr₃; NdI₂; NdI₃
oxides: Nd₂O₃
hydroxide: Nd(OH)₃
carbonate: Nd₂(CO₃)₃
sulfate: Nd₂(SO₄)₃
acetate: Nd(CH₃COO)₃
neodymium magnets (Nd₂Fe₁₄B)

Some neodymium compounds have colors that vary based on the type of lighting.^[1]

Neodymium compounds in fluorescent tube light—from left to right, the sulfate, nitrate, and chloride
Neodymium compounds in compact fluorescent lamp light
Neodymium compounds in normal daylight

Halides[edit]

Neodymium can form four trihalides of the form NdX₃. They can be prepared by reacting neodymium with the corresponding halogen:^[2]

2Nd (s) + 3F₂ (g) → 2NdF₃ (s) [a violet substance]

2Nd (s) + 3Cl₂ (g) → 2NdCl₃ (s) [a mauve substance]

2Nd (s) + 3Br₂ (g) → 2NdBr₃ (s) [a violet substance]

2Nd (s) + 3I₂ (g) → 2NdI₃ (s) [a green substance]

The dihalides NdCl₂ and NdBr₂ are dark green solids,^[3] with the same crystal structure as PbCl₂^[3] and NdI₂ is a dark purple solid. They can be obtained in the Nd-NdX₃ eutectic system.^[4]

Organoneodymium compounds[edit]

Organoneodymium compounds are compounds that have a neodymium–carbon bond. These compounds are similar to those of the other lanthanides, characterized by an inability to undergo π backbonding. They are thus mostly restricted to the mostly ionic cyclopentadienides (isostructural with those of lanthanum) and the σ-bonded simple alkyls and aryls, some of which may be polymeric.^[5]

^ Burke M.W. (1996) Lighting II: Sources. In: Image Acquisition. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-0069-1_2
^ Neodymium: reactions of elements Archived (Date missing) at webelements.com (Error: unknown archive URL). WebElements. [2017-4-10]
^ ^a ^b Georg Brauer (Hrsg.), unter Mitarbeit von Marianne Baudler u. a.: Handbuch der Präparativen Anorganischen Chemie. 3., umgearbeitete Auflage. Band I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6, S. 1081.
^ Leonard F. Druding, John D. Corbett (October 1959). "Rare Earth Metal-Metal Halide Systems. The Preparation of Neodymium(Ii) Halides". Journal of the American Chemical Society. 81 (20): 5512. doi:10.1021/ja01529a067. ISSN 0002-7863. Retrieved 2022-07-19.
^ Greenwood and Earnshaw, pp. 1248–9

[Lighting-1] Burke M.W. (1996) Lighting II: Sources. In: Image Acquisition. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-0069-1_2

[2] Neodymium: reactions of elements Archived (Date missing) at webelements.com (Error: unknown archive URL). WebElements. [2017-4-10]

[brauer-3] Georg Brauer (Hrsg.), unter Mitarbeit von Marianne Baudler u. a.: Handbuch der Präparativen Anorganischen Chemie. 3., umgearbeitete Auflage. Band I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6, S. 1081.

[4] Leonard F. Druding, John D. Corbett (October 1959). "Rare Earth Metal-Metal Halide Systems. The Preparation of Neodymium(Ii) Halides". Journal of the American Chemical Society. 81 (20): 5512. doi:10.1021/ja01529a067. ISSN 0002-7863. Retrieved 2022-07-19.

[Greenwood1248-5] Greenwood and Earnshaw, pp. 1248–9

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