Talk:Metal bis(trimethylsilyl)amides
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Stoichiometry?
[edit]The article is coming along fine. According to DCBradley's Inorg Synth prep, the stoichiometry is simply one MX3 and three LiNR2. They use no tricks involving chromous for the chromic compound. Another thing, since all the preps are fairly similar salt-forming processes, perhaps we should eventually aim for a table of the TM derivatives with colours, mp's, b.p.'s if known. --Smokefoot (talk) 18:07, 21 July 2011 (UTC) Thanks. Tables are a good idea. I'll try to do that this weekend. Any comments about the choice of precursor salts, e.g. why CaI2 or HgBr? That they are less hygroscopic? --Rifleman 82 (talk) 12:57, 22 July 2011 (UTC)
- The hygroscopic angle is a good idea. Alternatively, maybe these salts are more soluble in the THF, on the other hand the LiI would be too, but the products are probably purified in hexane. I would check the IS prep by Bradley.--Smokefoot (talk) 13:06, 22 July 2011 (UTC)
- How's your German? Maybe you can double check my translations when I'm done? --Rifleman 82 (talk) 17:05, 23 July 2011 (UTC)
I'm going to use the talk as a sandbox. Feel free to comment. --Rifleman 82 (talk) 17:00, 23 July 2011 (UTC)
Lanthanides
[edit]I've updated the Lanthanide section with the more common LnCl3 prep and expanded the table as Pr and Lu were missing. I'm afraid I've also replaced the melting ranges as I hate mixing values from different sources (and some of the old values were suspiciously low). I am, however, a little uncomfortable with the complexes being described as "Ln(hmds)3". My experience is limited to rare earth complexes, but I dont think I've ever seen that description used, "[Ln(N(SiMe3)2)3]" is pretty much standard. Would anyone be particuarly put out if I were to replace (hmds) with N(SiMe3)2 throughout the article? Project Osprey (talk) 13:16, 30 November 2012 (UTC)
Thanks for your contributions. I don't know, hmds is pretty common, but if you feel that N(SiMe3)2 is preferable, go for it. Since they are all commercially available, perhaps we can remove that column and put it in the text. --Rifleman 82 (talk) 14:53, 30 November 2012 (UTC)
d-Block complexes
[edit]| Compound | Appearance | m.p. (°C) | b.p. (°C) | Comment |
|---|---|---|---|---|
| Group 3 complexes | ||||
| Sc(hmds)3[1] | Colorless solid | 172-174 | ||
| Y(hmds)3 | White solid | 180-184 | 105°C/10 mmHg (subl.) | Commercially available |
| Group 4 complexes | ||||
| Ti(hmds)3[1] | Bright blue solid | Paramagnetic. Prepared from TiCl3(N(CH3)3)2 | ||
| Group 5 complexes | ||||
| V(hmds)3[1] | Brown solid | Prepared from VCl3(N(CH3)3)2 | ||
| Group 6 complexes | ||||
| Cr(hmds)3[1][2] | Apple-green solid | 120 | 110 / 0.5 mmHg (subl.) | Paramagnetic |
| Group 7 complexes | ||||
| Mn(hmds)2[2] | Beige solid | 100 / 0.2 mmHg | ||
| Group 8 complexes | ||||
| Fe(hmds)2[3] | Light green solid | 90-100 / 0.01 mmHg | ||
| Fe(hmds)3[1] | Dark green solid | 120 / 0.5 mmHg (subl.) | Paramagnetic | |
| Group 9 complexes | ||||
| Co(hmds)2[4] | Brown solid | 73 | 101 / 0.6 mmHg | |
| Group 10 complexes | ||||
| Ni(hmds)2[2] | Red liquid | 80 / 0.2 mmHg | ||
| Group 11 complexes | ||||
| Cu(hmds)[2] | Colorless solid | 180 / 0.2 mmHg (subl.) | ||
| Group 12 complexes | ||||
| Zn(hmds)2[5] | Colorless liquid | 12.5 | 82 / 0.5 mmHg | Commercially available |
| Cd(hmds)2[5] | Colorless liquid | 8 | 93 / 0.5 mmHg | |
| Hg(hmds)2[5] | Colorless liquid | 11 | 78 / 0.15 mmHg | |
Lanthanides
[edit]The lanthanides are similar in reactivity. Lanthanide triflates can be convenient anhydrous precursors to many bis(trimethylsilyl)amides:[6]
- Ln(OTf)<subs>3 + 3 M(hmds) → Ln(hmds)3 + 3 MOTf (M = Li, Na, K; Ln = La, Nd, Sm, Er)
| Compound | Appearance | m.p. (°C) | b.p. (°C) | Comment |
|---|---|---|---|---|
| La(hmds)3 | 149-153 | Commercially available | ||
| Ce(hmds)3 | 132-140 | Commercially available | ||
| Nd(hmds)3 | 156-159 | Commercially available | ||
| Sm(hmds)3 | 93-106 | Commercially available | ||
| Eu(hmds)3 | 147-154 | Commercially available | ||
| Gd(hmds)3 | 67-90 | Commercially available | ||
| Ho(hmds)3 | 165-169 | Commercially available | ||
| Tm(hmds)3 | 159-164 | Commercially available | ||
| Yb(hmds)3 | 162-164 | Commercially available |
References
[edit]- ^ a b c d e D. C. Bradley and R.G. Copperthwaite (1978). "Transition Metal Complexes of Bis(trimethylsilyl)amine". Inorg. Synth. Inorganic Syntheses. 18: 112–120. doi:10.1002/9780470132494.ch18. ISBN 9780470132494.
- ^ a b c d Cite error: The named reference
chromiumwas invoked but never defined (see the help page). - ^ Y. Ohki, S. Ohta, and K. Tatsumi (2010). "Monomeric Iron(II) Complexes Having Two Sterically Hindered Arylthiolates". Inorg. Synth. Inorganic Syntheses. 35: 137. doi:10.1002/9780470651568.ch7. ISBN 9780470651568.
{{cite journal}}: CS1 maint: multiple names: authors list (link) - ^ Cite error: The named reference
ironwas invoked but never defined (see the help page). - ^ a b c Bürger, H (1965). "Darstellung und schwinkungsspektren von silylamiden der elemente zink, cadmium und quecksilber". J. Organomet. Chem. 3 (2): 113–120. doi:10.1016/s0022-328x(00)84740-3.
- ^ Schuetz, Steven A.; Day, Victor W.; Sommer, Roger D.; Rheingold, Arnold L.; Belot, John A. (2001). "Anhydrous Lanthanide Schiff Base Complexes and Their Preparation Using Lanthanide Triflate Derived Amides". Inorg. Chem. 40 (20): 5292–5295. doi:10.1021/ic010060l.