Heavy Chiral Intermetallics
UncleAl0 at hate.spam.net
Sun Aug 19 21:33:58 EST 2001
Uncle Al needs a little help from x-ray crystallography adepts.
Uncle Al has a fetish for heavy atom chiral unit cells. If
anybody has a copy of CRYSTMET or ICSD gathering dust from lack
of use, behold a bit of scholarly recreation:
Cristal <cristal at cybercable.tm.fr> generously provided 16 chiral
ionic inorganic candidates. Alas, they were ferroelastic,
twinned (naughty naughty Pb_3_GeO_5_), metastable BiPO_4_)... and
BiTeI ICSD had the wrong structure entirely (J. Solid State Chem.
114 379 (1995) shows space group P3m1 (#156)). Bummer!
The only remaining possibilities are chiral intermetallics.
AuBe, AlPt, Al_5_W, CoU, and AlAu_4_ are already in hand. Can
anybody outdo Uncle Al?
The number of candidates is severely circumscribed by tight
1. Intermetallics only (*No* organics, organometallics, or
2. Unit cell volume less than 350 cubic angstroms. (We'll go
for a slightly bigger unit cell volume given the size of heavy
3. *Must* contain one or more atoms of Ta, W, Pt, Au, Tl, Pb,
4. *Only* space groups P3(1), P3(2), P4(1), P4(3), P6(2),
P6(4), P6(1), P6(5)
5. If no hits, then space groups P2, P2(1), C2, I4, I4(1),
P(4), P4(2), P3, R3, P6, P6(3)
6. *No* P2(1)3; no SnAu(5) (wrong assignment of space group).
Post 'em if you've got 'em. E-mail info at the URL above.
(If Trisomy 21 Down Syndrome Mongoloid idiots get lavish 24/7
State-supplied gratis medical care as their right, "ubi est mea?"
for a scholarly inquiry?)
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