User:Praseodymium-141/Neodymium/Compounds

Compounds

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

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

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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