1339 YTTRIUM ARSENIDE
yellow precipitate. See mercuric oxide, Derivation: Reduction of the oxide with lanthanum
yellow. or misch metal.
Grade: Regular high purity (ingots and lumps).
Use: Lasers, dopant for garnets, portable X-ray
yellow prussiate of potash. See potassium
source, chemical research.
ferrocyanide.
ytterbium chloride. YbCl
3
•6H
2
O.
yellow prussiate of soda. See sodium fer-
Properties: Green crystals. D 2.575, loses 6H
2
Oat
rocyanide.
180C, mp 865C. Very soluble in water; hygro-
scopic.
yellow rain. See mycotoxin.
ytterbium fluoride. YbF
3
.
yellow salt. See uranyl nitrate.
Properties: Solid. Mp 1157C, bp 2200C. Insoluble
in water; hygroscopic.
-yl. The suffix of univalent radicals derived from
Hazard: TLV: 2.5 mg(F)/m
3
.
aromatic hydrocarbons or heterocyclic compounds
by the removal of one hydrogen atom from the ring.
ytterbium oxide. (ytterbia). Yb
2
O
3
.
Properties: Colorless mass when free of thulia, tint-
ylang ylang oil. An essential, yellowish, vola-
ed brown or yellow when containing thulia. D 9.2,
tile oil distilled from the flowers of Cananga odora-
mp 2346C. The weakest base of the yttrium group,
ta. Strongly levorotatory.
except scandia and lutetia. Slightly hygroscopic,
Use: Perfumery.
absorbs water and carbon dioxide from the air. Solu-
See cananga oil.
ble in hot, dilute acids; less so in cold acids.
Use: Special alloys, dielectric ceramics, carbon rods
ylid. A substance in which a carbanion is attached
for industrial lighting, catalyst, special glasses.
to a heteratom with a high degree of positive charge,
i.e., >C
−
-X
+
. It is similar to a zwitterion and related to
ytterbium sulfate. Yb
2
(SO
4
)
3
•8H
2
O.
the Wittig reaction.
Properties: Crystalline solid. D 3.286. Soluble in
water.
-ylidene. (-ylidyne). A suffix for bivalent or tri-
valent radicals derived from saturated hydrocarbons
yttria. See yttrium oxide.
by the removal of two or three hydrogen atoms from
the same carbon atom.
yttrium.
CAS: 7440-65-5. Y. Metallic element of atomic
-ylidyne. See -ylidene.
number 39, group IIIB of the periodic table, aw
88.9059, valence of 3; no stable isotopes.
yohimbine. (aprodine; corynine; quebrachine).
Properties: Dark-gray metal. D 4.47, mp 1500C, bp
CAS: 146-48-5. C
21
H
26
O
3
N
2
.
2927C. Soluble in dilute acids and potassium hy-
Properties: Glistening, needlelike alkaloid, mp
droxide solution; decomposes water. Known only in
234C, soluble in alcohol and ether, very slightly
the tripositive state. Low neutron capture cross sec-
soluble in water.
tion.
Derivation: By extraction from the bark of Coryn-
Source: See rare-earth metals.
anthe yohimbe, found in the Cameroons.
Derivation: Reduction of the fluoride with calcium.
Hazard: Said to be an aphrodisiac. Toxic by inges-
Grade: Regular high purity (ingots, lumps, turnings),
tion.
metallurgical, low-oxygen, crystal sponge, powder.
Hazard: Flammable in finely divided form. TLV: 1
-yohimbine hydrochloride.
mg(Y)/m
3
.
CAS: 75444-63-2. mf: C
21
H
26
N
2
O
3
•ClH.
Use: Nuclear technology, iron and other alloys, deox-
Hazard: A poison by ingestion.
idizer for vanadium and other nonferrous metals,
microwave ferrites, coating on high-temperature al-
Young’s modulus. See modulus of elas-
loys, special semiconductors.
ticity.
yttrium acetate. Y(C
2
H
3
O
2
)
3
•9H
2
O.
ytterbium.
Properties: Colorless crystals. Soluble in water.
CAS: 7440-64-4. Yb. A metallic element. A rare-
Derivation: Action of acetic acid on yttrium oxide.
earth metal of yttrium subgroup, atomic number 70,
Use: Analytical chemistry.
aw 173.04, valence of 2, 3; exists in ␣ and  forms,
the latter being semiconductive at pressures above
yttrium antimonide. YSb. A high-purity bina-
16,000 atm. There are seven natural isotopes.
ry semiconductor.
Properties: Metallic luster, malleable. Mp 824C, bp
1427C, d 7.01. Reacts slowly with water; soluble in
dilute acids and liquid ammonia.
yttrium arsenide. YAs. A high-purity binary
Source: See rare-earth metals. semiconductor.
