Inorganic imide

The inorganic imide is an inorganic chemical compound containing

* an anion with the chemical formula HN2−, in which nitrogen atom is covalently bonded to one hydrogen atom (as in lithium imide Li
2NH and calcium imide CaNH). The other name of that anion is monohydrogen nitride.
* functional groups with the chemical formulas –NH– or =NH, in which nitrogen atom is also covalently bonded to one hydrogen atom, with two covalent single bonds or one covalent double bond from the nitrogen atom to other atoms, respectively (as in heptasulfur imide S
7NH, sulfur diimide S(=NH)
2 and nitroxyl O=NH).

Organic imides have the functional groups –NH– or =NH as well.

The imides are related to the inorganic amides, containing the H
2N−
anions, the nitrides, containing the N3− anions and the nitridohydrides or nitride hydrides, containing both nitride N3− and hydride H−
anions.

In addition to solid state imides, molecular imides are also known in dilute gases, where their spectrum can be studied.

When covalently bound to a metal, an imide ligand produces a transition metal imido complex.

When the hydrogen of the imide group is substituted by an organic group, an organoimide results. Complexes of actinide and rare earth elements with organoimides are known.[1]

## Contents

* 1 Properties
* 2 Structure
* 2.1 Imides in coordination chemistry
* 3 Formation
* 4 Hydrogen storage
* 5 List
* 5.1 Ionic
* 5.2 Molecular
* 6 References

## Properties

Lithium imide undergoes a phase transition at 87 °C where it goes from an ordered to a more symmetric disordered state.[2]

## Structure

Many imides have a cubic rock salt structure, with the metal and nitrogen occupying the main positions. The position of the hydrogen atom is hard to determine, but is disordered.

Many of the heavy metal simple imide molecules are linear. This is due to the filled 2p orbital of nitrogen donating electrons to an empty d orbital on the metal.[3]

### Imides in coordination chemistry

In coordination chemistry transition metal imido complexes feature the NR2- ligand. They are similar to oxo ligands in some respects. In some the M-N-C angle is 180º but often the angle is decidedly bent. The parent imide (NH2-) is an intermediate in nitrogen fixation by synthetic catalysts.[4]

Structure of a representative imido complex (py = pyridine, CMe3 = tert-butyl)[5]

## Formation

Heating lithium amide with lithium hydride yields lithium imide and hydrogen gas. This reaction takes place as released ammonia reacts with lithium hydride.[2]

Heating magnesium amide to about 400 °C yields magnesium imide with the loss of ammonia. Magnesium imide itself decomposes if heated between 455 and 490 °C.[6]

Beryllium imide forms from beryllium amide when heated to 230 °C in a vacuum.[7]

When strontium metal is heated with ammonia at 750 °C, the dark yellow strontium imide forms.[8]

When barium vapour is heated with ammonia in an electrical discharge, the gaseous, molecular BaNH is formed.[9] Molecules ScNH, YNH, and LaNH are also known.[10][11]

## Hydrogen storage

Inorganic imides are of interest because they can reversibly store hydrogen, which may be important for the hydrogen economy. For example, calcium imide can store 2.1% mass of hydrogen. Li
2Ca(NH)
2 reversibly stores hydrogen and release it at temperatures between 140 and 206 °C. It can reversibly hold 2.3% hydrogen.[12] When hydrogen is added to the imide, amides and hydrides are produced. When imides are heated, they can yield hydridonitrides or nitrides, but these may not easily reabsorb hydrogen.

## List

### Ionic

name  | formula  | structure  | space group  | unit cell  | references

|
|
|
|
|

Lithium imide | Li
2NH | cubic  | Fm3m | a=5.0742  | [2]
Beryllium imide  | BeNH  |  |  |  | [7]
Magnesium imide  | MgNH  | hexagonal  | P6/m | a = 11.567 Å c = 3.683Å Z=12  | [6]
Dilithium magnesium imide  | Li
2Mg(NH)
2 |  |  |  | [12]
Disilicon dinitride imide  | Si

2(NH) |  |  |  | [13]
| K
2Si(NH)
3 | amourphous  |  |  | [14]
| K
2Si
2(NH)
5 | amourphous  |  |  | [14]
| K
2Si
3(NH)
7 | amourphous  |  |  | [14]
potassium imido nitrido silicate  | K
3Si

5(NH)
6 | cubic  | P4332  | a = 10.789  | [13]
Calcium imide  | CaNH  | hexagonal  | Fm3m |  | [12]
Dilithium calcium imide  | Li
2Ca(NH)
2 | hexagonal  |  |  | [12]
Magnesium calcium diimide  | MgCa(NH)
2 | cubic  |  |  | [15]
Lithium calcium magnesium imide  | Li
4CaMg(NH)
4 |  |  |  | [12]
Strontium imide  | SrNH  | orthorhombic  | Pmna | a =7.5770 b =3.92260 c =5.69652 Z=4  | [8]
Tin(IV) diamide imide  | Sn(NH

2NH |  |  |  | [16][17]
Barium imide  | BaNH  | tetragonal  | I4/mmm | a=4.062 c=6.072 Z=2  | [18]
Lanthanum imide  | La
2(NH)
3 | rock salt  |  | a=5.32  | [19]
Cerium(II) imide  | CeNH  |  |  |  | [20]
Ytterbium(II) imide  | YbNH  | cubic  |  | a=4.85  | [21]
| [NH
4][Hg
3(NH)
2](NO

3 | cubic  | P4132  | a = 10.304, Z = 4  | [22]
Thorium(IV) dinitride imide  | Th

2(NH) | hexagonal  | P3m1 | a = 3.886 c = 6.185 Å  | [23]

### Molecular

name  | formula  | structure  | symmetry  | CAS  | references

|
|
|
|
|

Boron imide  | B
2(NH)
3 | polymer  |  |  | [24]

* Nitroxyl
* Azanal
* Azanone

| HNO  | bent  |  | 14332-28-6  |
Aluminium amide imide  | Al(NH
2)(NH) | polymer  |  |  | [24]
Silicon dimide  | Si(NH)
2 |  |  |  |

* Thionitrosyl hydride
* Azanethial
* Azanethione

| HNS  | bent  |  | 14616-59-2  | [25]
Sulfur diimide | S(NH)
2 |  |  |  |
Heptasulfur imide | S
7NH |  |  | 293-42-5  | [26]

* 1,2,3,4,5,7,6,8-Hexathiadiazocane
* 1,3-Hexasulfurdiimide
* 1,3-Diazacyclooctasulfane

| H

6 |  |  | 1003-75-4  |

* 1,2,3,4,6,7,5,8-Hexathiadiazocane
* 1,4-Hexasulfurdiimide
* 1,4-Diazacyclooctasulfane

| H

6 |  |  | 1003-76-5  |

* 1,2,3,5,6,7,4,8-Hexathiadiazocane
* 1,5-Hexasulfurdiimide
* 1,5-Diazacyclooctasulfane

| H

6 |  |  |  |

* 1,2,3,5,7,4,6,8-Pentathiatriazocane
* 1,3,5-Pentasulfurtriimide
* 1,3,5-Triazacyclooctasulfane

| H

5 |  |  | 638-50-6  |
Scandium(II) imide  | ScNH  |  |  |  | [10]
Gallium(III) imide  | Ga
2(NH)
3 | polymer  |  |  | [24]
Yttrium(II) imide  | YNH  |  |  |  | [10]
Barium imide  | BaNH  | linear  |  |  | [3]
Lanthanum(II) imide  | LaNH  | linear  | C∞v  |  | [11][27]
Cerium(II) imide  | CeNH  | linear  | C∞v  |  | [27]
Uranimine nitride  | N≡U=N–H |  |  |  | [28]
Uranimine dihydride  | HN=UH
2 |  |  |  | [28]

Molecular imines of other actinides called neptunimine and plutonimine have been postulated to exist in the gas phase or noble gas matrix.[29]

## References

1. ↑ Schädle, Dorothea; Anwander, Reiner (2019). "Rare-earth metal and actinide organoimide chemistry". Chemical Society Reviews 48 (24): 5752–5805. doi:10.1039/c8cs00932e. PMID 31720564.
2. ↑ 2.0 2.1 2.2 Lowton, Rebecca L. (1999). Structural and thermogravimetric studies of alkali metal amides and imides (PhD thesis). Oxford University, UK.
3. ↑ 3.0 3.1 Janczyk, Alexandra; Lichtenberger, Dennis L.; Ziurys, Lucy M. (February 2006). "Competition between Metal-Amido and Metal-Imido Chemistries in the Alkaline Earth Series: An Experimental and Theoretical Study of BaNH" (in en). Journal of the American Chemical Society 128 (4): 1109–1118. doi:10.1021/ja053473k. ISSN 0002-7863. PMID 16433526. Bibcode: 2006JAChS.128.1109J. https://pubs.acs.org/doi/10.1021/ja053473k.
4. ↑ Nugent, W. A.; Mayer, J. M., "Metal-Ligand Multiple Bonds," J. Wiley: New York, 1988.
5. ↑ Hazari, N.; Mountford, P., "Reactions and Applications of Titanium Imido Complexes", Acc. Chem. Res. 2005, 38, 839-849. doi:10.1021/ar030244z
6. ↑ 6.0 6.1 Dolci, Francesco; Napolitano, Emilio; Weidner, Eveline; Enzo, Stefano; Moretto, Pietro; Brunelli, Michela; Hansen, Thomas; Fichtner, Maximilian et al. (7 February 2011). "Magnesium Imide: Synthesis and Structure Determination of an Unconventional Alkaline Earth Imide from Decomposition of Magnesium Amide". Inorganic Chemistry 50 (3): 1116–1122. doi:10.1021/ic1023778. PMID 21190329. https://d1wqtxts1xzle7.cloudfront.net/43709303/IC_11_Dolci.pdf?1457950512=&response-content-disposition=inline;+filename=Magnesium_Imide_Synthesis_and_Structure.pdf.
7. ↑ 7.0 7.1 Jacobs, Herbert; Juza, Robert (November 1969). "Darstellung und Eigenschaften von Berylliumamid und -imid" (in de). Zeitschrift für anorganische und allgemeine Chemie 370 (5–6): 248–253. doi:10.1002/zaac.19693700507. ISSN 0044-2313. http://doi.wiley.com/10.1002/zaac.19693700507.
8. ↑ 8.0 8.1 Schultz-Coulon, Verena; Irran, Elisabeth; Putz, Bernd; Schnick, Wolfgang (1999). "β-SrNH und β-SrND – Synthese und Kristallstrukturbestimmung mittels Röntgen- und Neutronenbeugung an Pulvern". Zeitschrift für anorganische und allgemeine Chemie 625 (7): 1086–1092. doi:10.1002/(SICI)1521-3749(199907)625:7<1086::AID-ZAAC1086>3.0.CO;2-B.
9. ↑ Janczyk, Alexandra; Lichtenberger, Dennis L.; Ziurys, Lucy M. (February 2006). "Competition between Metal-Amido and Metal-Imido Chemistries in the Alkaline Earth Series: An Experimental and Theoretical Study of BaNH". Journal of the American Chemical Society 128 (4): 1109–1118. doi:10.1021/ja053473k. PMID 16433526. Bibcode: 2006JAChS.128.1109J.
10. ↑ 10.0 10.1 10.2 Bhattacharyya, Soumen; Harrison, James F. (September 2020). "Electronic structure and bonding of the ScNH and YNH molecules". Chemical Physics Letters 754. doi:10.1016/j.cplett.2020.137735. Bibcode: 2020CPL...75437735B.
11. ↑ 11.0 11.1 Bhattacharyya, Soumen; Harrison, J. F. (1 September 2019). "Theoretical study of the electronic structure and bonding of LaNH". Chemical Physics Letters 730: 551–556. doi:10.1016/j.cplett.2019.06.042. Bibcode: 2019CPL...730..551B.
12. ↑ 12.0 12.1 12.2 12.3 12.4 Verbraeken, Maarten Christiaan (February 2009). Doped Alkaline Earth (nitride) Hydrides (Thesis). University of St Andrews. p. 19\. hdl:10023/714.
13. ↑ 13.0 13.1 Peters, D.; Paulus, E. F.; Jacobs, H. (1990). "Darstellung und Kristallstruktur eines Kaliumimidonitridosilicats, K3Si6N5(NH)6" (in de). Zeitschrift für anorganische und allgemeine Chemie 584 (1): 129–137. doi:10.1002/zaac.19905840112. ISSN 0044-2313. http://doi.wiley.com/10.1002/zaac.19905840112.
14. ↑ 14.0 14.1 14.2 Ali, S. I. (December 1970). "Reactions of Silicon Tetrabromide and -iodide with Potassium Amide in liquid ammonia" (in de). Zeitschrift für anorganische und allgemeine Chemie 379 (1): 68–71. doi:10.1002/zaac.19703790112. ISSN 0044-2313. http://doi.wiley.com/10.1002/zaac.19703790112.
15. ↑ Liu, Yongfeng; Liu, Tao; Xiong, Zhitao; Hu, Jianjiang; Wu, Guotao; Chen, Ping; Wee, Andrew T. S.; Yang, Ping et al. (November 2006). "Synthesis and Structural Characterization of a New Alkaline Earth Imide: MgCa(NH)2". European Journal of Inorganic Chemistry 2006 (21): 4368–4373. doi:10.1002/ejic.200600492.
16. ↑ Watney, Nicholas S. P.; Gál, Zoltán A.; Webster, Matthew D. S.; Clarke, Simon J. (2005). "The first ternary tin(ii) nitride: NaSnN" (in en). Chemical Communications (33): 4190–2. doi:10.1039/b505208d. ISSN 1359-7345. PMID 16100599. http://xlink.rsc.org/?DOI=b505208d.
17. ↑ Maya, Leon (May 1992). "Preparation of tin nitride via an amide-imide intermediate" (in en). Inorganic Chemistry 31 (10): 1958–1960. doi:10.1021/ic00036a044. ISSN 0020-1669. https://pubs.acs.org/doi/abs/10.1021/ic00036a044.
18. ↑ Wegner, B.; Essmann, R.; Jacobs, H.; Fischer, P. (December 1990). "Synthesis of barium imide from the elements and orientational disorder of anions in BaND studied by neutron diffraction from 8 to 294 K" (in en). Journal of the Less Common Metals 167 (1): 81–90. doi:10.1016/0022-5088(90)90291-Q.
19. ↑ Jacobs, H; Gieger, B; Hadenfeldt, C (March 1979). "Über das system kalium/lanthan/ammoniak" (in de). Journal of the Less Common Metals 64 (1): 91–99. doi:10.1016/0022-5088(79)90136-X. https://linkinghub.elsevier.com/retrieve/pii/002250887990136X.
20. ↑ Imamura, Hayao; Kawasoe, Masahiro; Imayoshi, Kyouya; Sakata, Yoshihisa (2015). "Preparation and Some Properties of Nanostructural Rare Earth Nitrides by Using the Reaction of Hydrides with Ammonia". International Journal of Theoretical and Applied Nanotechnology 3: 1–8. doi:10.11159/ijtan.2015.001. http://ijtan.avestia.com/2015/001.html.
21. ↑ Imamura, Hayao (2000), "Chapter 182 The metals and alloys (prepared utilizing liquid ammonia solutions) in catalysis II" (in en), The Role of Rare Earths in Catalysis, Handbook on the Physics and Chemistry of Rare Earths, 29, Elsevier, pp. 45–74, doi:10.1016/s0168-1273(00)29005-3, ISBN 978-0-444-50472-2, https://linkinghub.elsevier.com/retrieve/pii/S0168127300290053, retrieved 2020-11-10
22. ↑ Nockemann, Peter; Meyer, Gerd (2002). "Bildung von NH4[Hg3(NH)2](NO3)3 und Umwandlung in [Hg2N](NO3)". Zeitschrift für Anorganische und Allgemeine Chemie 628 (12): 2709–2714. doi:10.1002/1521-3749(200212)628:12<2709::AID-ZAAC2709>3.0.CO;2-P.
23. ↑ Silva, G. W. Chinthaka; Yeamans, Charles B.; Weck, Philppe F.; Hunn, John D.; Cerefice, Gary S.; Sattelberger, Alfred P.; Czerwinski, Ken R. (2012-03-05). "Synthesis and Characterization of Th 2 N 2 (NH) Isomorphous to Th 2 N 3" (in en). Inorganic Chemistry 51 (5): 3332–3340. doi:10.1021/ic300025b. ISSN 0020-1669. PMID 22360445. https://pubs.acs.org/doi/10.1021/ic300025b.
24. ↑ 24.0 24.1 24.2 Janik, Jerzy F.; Wells, Richard L. (January 1996). "Gallium Imide, {Ga(NH) 3/2 } n , a New Polymeric Precursor for Gallium Nitride Powders" (in en). Chemistry of Materials 8 (12): 2708–2711. doi:10.1021/cm960419h. ISSN 0897-4756. https://pubs.acs.org/doi/10.1021/cm960419h.
25. ↑ Nguyen, Minh Tho; Vanquickenborne, L.G.; Plisnier, Michel; Flammang, Robert (January 1993). "A mass spectrometric and ab initio molecular orbital characterization of thionitrosyl hydride (H-N=S)" (in en). Molecular Physics 78 (1): 111–119. doi:10.1080/00268979300100111. ISSN 0026-8976. Bibcode: 1993MolPh..78..111N. http://www.tandfonline.com/doi/abs/10.1080/00268979300100111.
26. ↑ Mendelsohn, M.H.; Jolly, W.L. (January 1973). "Reactions of the heptasulfur imide anion". Journal of Inorganic and Nuclear Chemistry 35 (1): 95–99. doi:10.1016/0022-1902(73)80614-1. https://escholarship.org/uc/item/97d7b60v.
27. ↑ 27.0 27.1 Zhang, Yuchen; Nyambo, Silver; Yang, Dong-Sheng (2018-12-21). "Mass-analyzed threshold ionization spectroscopy of lanthanide imide LnNH (Ln = La and Ce) radicals from N–H bond activation of ammonia" (in en). The Journal of Chemical Physics 149 (23): 234301. doi:10.1063/1.5064597. ISSN 0021-9606. PMID 30579310. Bibcode: 2018JChPh.149w4301Z. http://aip.scitation.org/doi/10.1063/1.5064597.
28. ↑ 28.0 28.1 Wang, Xuefeng; Andrews, Lester; Vlaisavljevich, Bess; Gagliardi, Laura (2011-04-18). "Combined Triple and Double Bonds to Uranium: The N≡U═N−H Uranimine Nitride Molecule Prepared in Solid Argon" (in en). Inorganic Chemistry 50 (8): 3826–3831. doi:10.1021/ic2003244. ISSN 0020-1669. PMID 21405096. https://pubs.acs.org/doi/10.1021/ic2003244.
29. ↑ Li, Peng; Niu, Wenxia; Gao, Tao (2015-11-25). "Systematic analysis of structural and spectroscopic properties of neptunimine (HN=NpH2) and plutonimine (HN=PuH2)" (in en). Journal of Molecular Modeling 21 (12): 316. doi:10.1007/s00894-015-2856-1. ISSN 0948-5023. PMID 26608606.

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