Germyl

Germyl  Names

IUPAC name

Germanide

Other names

Trihydridogermanate(1-)
Trihydridogermanate(IV)
Trihydrogen germanide
Trihydrogermanide
Trihydridogermyl

Identifiers

CAS Number

* radical: 13765-45-2

3D model (JSmol)

* anion: Interactive image
* radical: Interactive image

ChEBI |

* anion: CHEBI:30552

ChemSpider |

* anion: 21865063
* radical: 4573980

Gmelin Reference

| 305156

InChI

* anion: InChI=1S/GeH3/h1H3/q-1

Key: SCCCLDWUZODEKG-UHFFFAOYSA-N

* radical: InChI=1S/GeH3/h1H3

Key: WHYHZFHCWGGCOP-UHFFFAOYSA-N

SMILES

* anion: [GeH3-]

* radical: [GeH3]

Properties

Chemical formula

| GeH−3
Molar mass | 75.654 g·mol−1
Related compounds

Other cations

| Silanide (-SiH3);
Stannyl (-SnH3)

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Infobox references

Chemical compound

Germyl, trihydridogermanate(1-), trihydrogermanide, trihydridogermyl or according to IUPAC Red Book: germanide[1] is an anion containing germanium bounded with three hydrogens, with formula GeH−3. Germyl is the IUPAC term for the –GeH3 group. For less electropositive elements the bond can be considered covalent rather than ionic as "germanide" indicates. Germanide is the base for germane when it loses a proton.

GeH4 → GeH−3 \+ H+

The first germyl compound to be discovered was sodium germyl. Germane was reacted with sodium dissolved in liquid ammonia to produce sodium germyl.[2][3] Other alkali metal germyl compounds are known. There are also numerous transition metal complexes that contain germyl as a ligand.

## Formation[edit]

Alkali metal germyl compounds have been made by reacting germane with the alkali metal dissolved in liquid ammonia, or other non-reactive solvent.

Transition metal complexes cam be made by using lithium aluminium hydride to reduce a trichlorogermyl complex (−GeCl3), which in turn can be made from the transition metal complex chloride and GeCl2.[4]

Salt elimination can be used in a reaction with monochlorogermane and a sodium salt of a transition metal anion:

GeClH3 \+ NaMn(CO)5 → NaCl + Mn(GeH3)(CO)5.[4]

In the gas phase, the germyl anion GeH−3 can be made from germane by capturing an electron with more than 8 eV of energy:

GeH4 \+ e− → GeH−3 \+ H•[5]

The germyl radical can be produced and immobilised in molecular form by exposing germane to vacuum ultraviolet light in a solid argon matrix. On heating, digermane is formed:

2 GeH3• → GeH3GeH3[6]

## Properties[edit]

Germyl compounds react with water, so water cannot be used as a solvent. Liquids that have been used as solvents include liquid ammonia, ethyl amine, diglyme, or hexamethylphosphoramide. The choice of solvent depends on the temperature desired, whether alkali metals are going to be dissolved, whether the solvent needs to be distilled, and also if it reacts with the solute.[7]

The bond between the metal ion and the germyl ion may be purely ionic, but may also be bonded via two bridging hydrogen atoms.[8]

The energy to rip a hydrogen atom off germane to make the neutral radical is 82.0±2 kcal/mol. GeH4 → GeH3• \+ H•.[5] Electron affinity for the radical is 1.6 eV: GeH3• \+ e− → GeH3−.[5]

Gas phase acidity of germane is ΔG°
acid is 350.8±1.3 kcal/mol; ΔH°
acid is 358.9 kcal/mol for GeH4 → GeH−3 \+ H+.[5]

Both the anion GeH−3 and radical GeH•
3 have C3v symmetry, and are shaped as a triangular pyramid with germanium at the top, and three hydrogen atoms at the bottom.[5] In the radical, the H-Ge-H angle is 110°. In the anion the H-Ge-H angle is about 93°.[5]

## Reactions[edit]

Germyl compounds gradually decompose at room temperature by releasing hydrogen and forming a metal germide.[3]

Germyl compounds react with alkyl halides to substitute the germyl −GeH3 group for the halogen. With aromatic halide compounds, dihalomethanes, or neopentyl haldes they replace the halogen with hydrogen.[2] Organogermanium compounds that can be produced include methyl germane, dimethyl germane, digermyl methane, digermyl ethane, digermyl propane.[2]

The germyl ion reacts with water to yield germane:

GeH−3 \+ H2O → GeH4 \+ OH−[3]

Sodium germyl reacts with oxygen to form an orthogermanate:

NaGeH3 \+ O2 → NaOGe(OH)3

This loses water at room temperature.[3]

K[η5-C5H5)Mn(CO)2GeH3] reacts with acid to yield [η5-C5H5)Mn(CO)2]2Ge which has a Mn=Ge=Mn linkage in it.[9]

## List[edit]

formula  | name  | mw  | system  | space group  | unit cell  | volume  | density  | comments  | ref

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LiGeH3 |  |  |  |  |  |  |  |  | [10]
LiGeH
3•2NH
3 |  |  |  |  |  |  |  |  | [11]
NaGeH3 | Sodium Trihydrogermanide  |  |  |  |  |  |  | white  | [3]
NaGeH
3•2NH
3 |  |  |  |  |  |  |  |  | [3]
NaGeH
3•4.5NH
3 |  |  |  |  |  |  |  |  | [3]
NaGeH
3•6NH
3 |  |  |  |  |  |  |  |  | [3]
P(GeH3)3 |  |  |  |  |  |  |  |  | [12]
KGeH3 |  |  | cubic  |  | a=7.235  |  | 2.003  | NaCl structure  | [13][10]
K([18]crown-6)(thf)GeH3 |  | 451.13  | monoclinic  | Pc | a=13.8587 b=9.9670 c=16.9439 β=107.206 Z=4  | 2235.7  | 1.34  | colourless  | [8]
K([15]crown-5)2GeH3 |  | 555.23  | tetrahedral  | I4 | a=12.685 c=16.985 Z=4  | 2733.0  | 1.349  | colourless  | [8]
K([12]crown-4)2GeH3 |  | 467.13  | monoclinic  | C2/c | a=40.7694 b=6.623 c=29.6746 β=97.450 Z=16  | 9144.9  | 1.357  | colourless  | [8]
K[V(CO)3(η5-C5H5)GeH3]  |  |  |  |  |  |  |  |  | [14]
[PPh4][V(CO)3(η5-C5H5)GeH3]  |  |  | orthorhombic  | Pcab | a=17.47 b=15.68 c=21.49 Z=8  | 5886  | 1.39  | yellow  | [14][15]
K[Cr(CO)5GeH3]  |  |  |  |  |  |  |  |  | [16]
[PPh4][Cr(CO)5GeH3]  |  |  | monoclinic  | C2/c | a=22.301 b=6.989 c=18.002 β=? Z=4  | 2788.5  | 1.45  | yellow  | [16][15]
Mn(GeH3)(CO)5 |  |  |  |  |  |  |  |  | [9]
Mn(GeH3)(CO)2(PPh(OEt)2)3 |  |  |  |  |  |  |  | pale yellow  | [4]
Mn(GeH3)(CO)3(PPh(OEt)2)2 |  | 610.96  | triclinic  | P1 | a=10.118 b=11.060 c=13.009 α=97.859 β=98.612 γ=92.856 Z=2  | 1422.3  | 1.427  | pale yellow  | [4]
Mn(GeH3)(CO)2(P(OEt)3)3 |  |  |  |  |  |  |  | pale yellow  | [4]
Mn(GeH3)(CO)3(P(OEt)3)2 |  |  |  |  |  |  |  | pale yellow  | [4]
K[η5-C5H5)Mn(CO)2GeH3]  |  |  |  |  |  |  |  |  | [9]
[(CH3)4N][η-CH3C5H4Mn(CO)2GeH3]  |  |  | triclinic  | P1 | a=6.948 b=9.658 c=11.784 α=89.57 β=77.37 γ=88.05 Z=2  | 772  | 1.45  |  | [17]
[(CH3)4N][η-CH3C5H4Mn(CO)2GeH3]  |  |  | triclinic  | P1 | a=6.958 b=9.658 c=11.784 α=89.57 β=77.37 γ=88.05 Z=2  | 772  | 1.46  |  | [18]
(GeH3)2Fe(CO)4 | digermyltetracarbonyliron  |  |  |  |  |  |  | mp 71°C colourless  | [19]
GeH3(H)Fe(CO)4 | monogermylhydridotetracarbonyliron  |  |  |  |  |  |  | mp −30°C colourless  | [19]
GeH3Fe(C5H5)(CO)2 | Germyl(cyclopentadienyl)dicarbonyliron  |  |  |  |  |  |  | mp 81°C yellow  | [19]
Fe(CO)4(GeH2GeH3)(GeH3)  |  |  |  |  |  |  |  |  | [20]
Fe(CO)4(GeH3)(GeMe3)  |  |  |  |  |  |  |  |  | [21]
{Fe(CO)4(GeH2)}2 |  |  |  |  |  |  |  | -Fe-Ge-Fe-Ge- ring  | [22]
K[Co2(CO)7GeH3]  |  |  |  |  |  |  |  |  | [16]
[PPh4]Co2(CO)7GeH3]  |  |  |  |  |  |  |  |  | [16]
K[Co-(CO)(η5C6H5)GeH3]  |  |  |  |  |  |  |  |  | [14]
[PPh4][Co-(CO)(η5C6H5)GeH3]  |  |  |  |  |  |  |  |  | [14]
K[Co-(CO)(η5C6(CH3)5)GeH3]  |  |  |  |  |  |  |  |  | [14]
[PPh4][Co-(CO)(η5C6(CH3)5)GeH3]  |  |  |  |  |  |  |  |  | [14]
K[(η5-C5H5)-Mn(CO)2GeH3]  |  |  |  |  |  |  |  |  | [16]
K[Ni(CO)3GeH3]  |  |  |  |  |  |  |  |  | [14]
[PPh4][Ni(CO)3GeH3]  |  |  | monoclinic  | C2  | a=16.855 b=7.098 c=15.189 β=134.71 Z=2  | 1291.5  | 1.43  | orange yellow  | [14][15]
K[Ni(CO)2(PPh3)GeH3]  |  |  |  |  |  |  |  |  | [14]
[PPh4][Ni(CO)2(PPh3)GeH3]  |  |  | monoclinic  | P21/n | a=10.37 b=22.37 c=16.95 β=96.23 Z=4  | 2910.6  | 1.74  | orange yellow  | [14][15]
As(GeH3)3 |  |  |  |  |  |  |  |  | [12]
Rb([18]crown-6)(thf)GeH3 |  | 497.50  | monoclinic  | Cc | a=13.8336 b=9.9878 c=16.9893 β=107.417 Z=4  | 2239.7  | 1.475  | colourless  | [8]
RbGeH3 |  |  |  |  | a=7.518  |  | 2.518  |  | [10]
K[Nb(CO)3(η5-C5H5)GeH3]  |  |  |  |  |  |  |  |  | [14]
[PPh4][Nb(CO)3(η5-C5H5)GeH3]  |  |  |  |  |  |  |  |  | [14]
K[Mo(CO)5GeH3]  |  |  |  |  |  |  |  |  | [14]
[PPh4][Mo(CO)5GeH3]  |  |  | monoclinic  | C2/c | a=22.25 b=7.021 c=18.545 β=96.14 Z=4  | 2881  | 1.5  | yellow  | [14][15]
Ru(GeH3)(η5-C5H5)(PPh3)P(OMe)3 |  | 628.12  | monoclinic  | P21/c | a=17.932 b=10.067 c=16.375, β=114.508° Z=4  | 2689.6  | 1.551  | yellow  | [23]
Ru(GeH3)(η5-C5H5)(PPh3)P(OEt)3 |  |  |  |  |  |  |  | yellow  | [23]
Ru(GeH3)(η5-C5H5)(PPh3)PPh(OEt)2 |  |  |  |  |  |  |  | yellow  | [23]
Ru(GeH3)(η5-C9H7)(PPh3)P(OMe)3 |  |  |  |  |  |  |  | yellow  | [23]
Ru(GeH3)(η5-C9H7)(PPh3)P(OEt)3 |  |  |  |  |  |  |  | yellow  | [23]
Ru(GeH3)(η5-C9H7)(PPh3)PPh(OEt)2 |  |  |  |  |  |  |  | yellow  | [23]
Ru(GeH3)(Tp)(PPh3))P(OEt)3 |  |  |  |  |  |  |  | yellow  | [23]
Ru(GeH3)(Tp)(PPh3)PPh(OEt)2 |  |  |  |  |  |  |  | yellow  | [23]
cis-[Ru(dppe)2(GeH3)H]•C6H6 |  | 1014.4  | triclinic  | P1 | a 12.3464 b 13.2412 c 16.2053, α 90.055° β 98.868° γ 116.164° Z=2  | 2342.3  | 1.438  |  | [24]
trans-[Ru(dppe)2(GeH3)H]  |  |  |  |  |  |  |  |  | [24]
cis-[Ru(depe)2(GeH3)H]  |  |  |  |  |  |  |  |  | [24]
trans-[Ru(depe)2(GeH3)H]  |  |  |  |  |  |  |  |  | [24]
cis-[Ru(dmpe)2(GeH3)H]  |  |  |  |  |  |  |  |  | [24]
trans-[Ru(dmpe)2(GeH3)H]  |  |  |  |  |  |  |  |  | [24]
cis-[Ru(DuPhos)2(GeH3)H]  |  | 790.38  | orthorhombic  | P212121 | a 10.1222 b 18.4327 c 19.425 Z=4  | 3624.4  | 1.448  |  | [24]
Ru(GeH3)(Cp′)L Cp′=η5-C5Me5 L=1,2-[bis(diphenyl) phosphanyloxy]-1,2-diphenylethane  |  |  |  |  |  |  |  |  | [25]
Ru(GeH3)(Cp′)L Cp′=η5-C9H7 L=1,2-[bis(diphenyl) phosphanyloxy]-1,2-diphenylethane  |  |  |  |  |  |  |  |  | [25]
Sb(GeH3)3 | trigermylstibine  |  |  |  |  |  |  |  | [26]
Cs([18]crown-6)2GeH3 |  | 734.12  | tetrahedral  | P4/n | a=13.2513 c=19.0577 Z=4  | 3346.5  | 1.457  | colourless  | [8]
CsGeH3 |  |  | orthorhombic  |  | a=5.1675 b=14.435 c=5.9664  |  | 3.111  |  | [10]
K[W(CO)5GeH3]  |  |  |  |  |  |  |  |  | [16][14]
[PPh4][W(CO)5GeH3]  |  |  | monoclinic  | C2/c | a=22.227 b=7.025 c=18.529 β=96.11 Z=4  | 2883.2  | 1.71  | yellow  | [14][15]
GeH3Re(CO)5 | Germylpentacarbonylrhenium  |  |  |  |  |  |  | colourless mp 53-54°C  | [27]
GeH2[Re(CO)5]2 | bis(pentacarbonylrhenium)germane  |  |  |  |  |  |  |  | [27]
Re(GeH3)(CO)2(PPh(OEt)2)3 |  |  |  |  |  |  |  | white  | [4]
Re(GeH3)(CO)3(PPh(OEt)2)2 |  |  |  |  |  |  |  | white  | [4]
Re(GeH3)(CO)2(P(OEt)3)3 |  |  |  |  |  |  |  | white  | [4]
Re(GeH3)(CO)3(P(OEt)3)2 |  |  |  |  |  |  |  | white  | [4]
K[Re(CO)2(η5-C5H5)GeH3]  |  |  |  |  |  |  |  |  | [14]
[PPh4][Re(CO)2(η5-C5H5)GeH3]  |  |  |  |  |  |  |  |  | [14]
Os(GeH3)(Tp)(PPh3)P(OMe)3 Tp = tris(pyrazolyl)borate  |  |  |  |  |  |  |  | white  | [23]

## Related[edit]

Germylidyne with formula ≡GeH has a triple bond to the metal atom.[28]

Germylidene with base formula =GeH2 has a double bond to the central metal.[29]

## References[edit]

1. ^ Red Book. IUPAC. 2005. p. 298.
2. ^ a b c Dreyfuss, R. M.; Jolly, W. L. (1 June 1971). "The Reaction of Potassium Germyl with Organic Halides".
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14. ^ a b c d e f g h i j k l m n o p q r Pohlmann, Heinrich; Weiss, Erwin (August 1988). "GeH3-substituierte Carbonylmetallate und Carbonyl(cyclopentadienyl)-metallate mit V, Nb, Cr, Mo, W, Re, Co und Ni Präparative und röntgenographische Untersuchungen". Chemische Berichte (in German). 121 (8): 1427–1433. doi:10.1002/cber.19881210812.
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16. ^ a b c d e f Melzer, Detlef; Weiss, Erwin (July 1984). "GeH3-Substituierte Carbonylmetallate von Cr, W, Mn und Co. Die Kristallstruktur von [PPh4]Cr(CO)5GeH3]". Chemische Berichte (in German). 117 (7): 2464–2468. doi:10.1002/cber.19841170717.
17. ^ Gäde, Wolfgang; Weiss, Erwin (July 1981). "Carbonyl(cyclopentadienyl)mangan-Verbindungen mit Mn — GeH3- und Mn — GeCl3-Gruppen. Die Kristallstrukturen von [(CH3)4N][η-CH3C5H4Mn(CO)2GeH3] und η-CH3C5H4Mn(CO)2(GeCl3)2". Chemische Berichte (in German). 114 (7): 2399–2404. doi:10.1002/cber.19811140706.
18. ^ Gäde, Wolfgang; Weiss, Erwin (July 1981). "Carbonyl(cyclopentadienyl)mangan-Verbindungen mit Mn — GeH3- und Mn — GeCl3-Gruppen. Die Kristallstrukturen von [(CH3)4N][η-CH3C5H4Mn(CO)2GeH3] und η-CH3C5H4Mn(CO)2(GeCl3)2". Chemische Berichte (in German). 114 (7): 2399–2404. doi:10.1002/cber.19811140706.
19. ^ a b c Stobart, S. R. (1972). "Transition-metal carbonyl derivatives of the Germanes. Part III. Germyl(carbonyl)iron complexes". Journal of the Chemical Society, Dalton Transactions (22): 2442–2447. doi:10.1039/dt9720002442. ISSN 0300-9246.
20. ^ BONNY, A; MACKAY, K. M.; SIN WONG, F. (1985). "Transition metal carbonyl derivatives of the germanes. XVI: Preparation and properties of the digermane-tetracarbonyliron compounds, [Fe(CO)4(GeH2GeH3)2] and [Fe(CO)4(GeH2GeH3)(GeH3)] with some observations on [Fe(CO)4(GeH3)2]". Journal of Chemical Research. Synopses (2): 40–41. ISSN 0308-2342.`{{cite journal}}`: CS1 maint: date and year (link)
21. ^ Anema, Skelte G.; Audett (née Christie), Judy A.; Mackay, Kenneth M.; Nicholson, Brian K. (1988). "Transition-metal carbonyl derivatives of the germanes. Part 17. Tetracarbonylgermyl(trimethylgermyl)iron, [Fe(CO) 4 (GeH 3 )(GeMe 3 )], its conversion into [{Fe(CO) 4 (GeH 2 )} 2 ], and hence to [Co 4 Fe 2 Ge 2 (CO) 21 ](characterised by X-ray crystallography)via[Co 4 Fe 2 Ge 2 (CO) 22 ]". J. Chem. Soc., Dalton Trans. (10): 2629–2634. doi:10.1039/DT9880002629. ISSN 0300-9246.
22. ^ Anema, Skelte G.; Audett (née Christie), Judy A.; Mackay, Kenneth M.; Nicholson, Brian K. (1988). "Transition-metal carbonyl derivatives of the germanes. Part 17. Tetracarbonylgermyl(trimethylgermyl)iron, [Fe(CO) 4 (GeH 3 )(GeMe 3 )], its conversion into [{Fe(CO) 4 (GeH 2 )} 2 ], and hence to [Co 4 Fe 2 Ge 2 (CO) 21 ](characterised by X-ray crystallography)via[Co 4 Fe 2 Ge 2 (CO) 22 ]". J. Chem. Soc., Dalton Trans. (10): 2629–2634. doi:10.1039/DT9880002629. ISSN 0300-9246.
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