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Sunday, 07 August 2011 00:49

Boranes: Physical & Chemical Properties

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Chemical Name

CAS-Number

Colour/Form

Boiling Point (°C)

Melting Point (°C)

Molecular Weight

Solubility in Water

Relative Density (water=1)

Relative Vapour Density (air=1)

Vapour Pressure/ (Kpa)

Inflam.
Limits

Flash Point (°C)

Auto Ignition Point (°C)

BORON
7440-42-8

polymorphic: alpha-rhombohedral form, clear red crystals; beta-rhombohedral form, black; alpha-tetragonal form, black, opaque crystals with metallic luster; amorphous form, black or dark brown powder; other crystal forms known

2550

2300

10.81

insol

Amorphous, 2.3 g/cm3; alpha-­rhombohedral, ­2.46 g/cm3; ­alpha-­tetragonal, ­2.31 g/cm3; ­beta-rhom­bohedral, ­2.35 g/cm3

@ 2140 °C

580

BORIC ACID, DISODIUM SALT
1330-43-4

powder or glass-like plates; white, free-flowing crystals; light grey solid

1575

741

201.3

2.56 g/100 g

2.367

BORON OXIDE
1303-86-2

rhombic crystals; colourless, semitransparent lumps or hard, white crystals

1860

450

69.6

2.77 g/100 g

1.8 (amorphous); 2.46 (crystalline)

BORON TRIBROMIDE
10294-33-4

colourless liquid

90

-46.0

250.57

reacts

@ 18.4 °C/4 °C

8.6

@ 14 °C

BORON TRICHLORIDE
10294-34-5

12.5

-107

117.16

@ 12 °C/4

4.03

@ 12.4 °C

BORON TRIFLUORIDE
7637-07-2

colourless gas

-99.9

-126.8

67.82

reacts

@ 4 °C

2.4

@ -141 °C. (solid); 760 mm Hg 110.7 °C (liquid)

BORON TRIFLUORIDE ETHERATE
109-63-7

liquid; colourless

125.7

-60.4

141.94

1.3572

64 oc

DECABORANE
17702-41-9

white crystals; orthorhombic crystals; colourless or white crystalline needles

213

99.5

122.21

sl sol

@ 25 °C; liquid: 0.78

4.2

@ 25 °C

80 cc

149

DIBORANE
19287-45-7

colourless gas

-92.5

-165

27.69

sl sol

@ 15 °C

0.96

@ -112 °C

0.8 ll
88 ul

flammable gas

40-50

PENTABORANE
19624-22-7

colourless liquid

60

-46.6

63.2

reacts

@ 0 °C/4 °C

2.2

22.8

0.42 ll
98 ul

30 cc

35

SODIUM PERBORATE
7632-04-4

white, amorphous powder

81.80

SODIUM TETRAHYDROBORATE
16940-66-2

white cubic crystal; white to gray-white microcrystalline powder or lump

400 decomp slowly; 500 decoMelting Point rapidly

36

37.8

v sol

1.07

SODIUM TETRABORATE DECAHYDRATE
1303-96-4

colourless, monoclinic crystals; hard crystals, granules or crystalline powder; white, gray, bluish or greenish white streak, vitreous or dull luster

320

75

381.4

5.92 g/100 g

1.73

TRIETHYLBORANE
97-94-9

colourless liquid

95-96

-92.9

98.00

@ 23 °C

TRIMETHYL BORATE
121-43-7

water-white liquid

67-68

-29.3

103.9

reacts

0.91

3.6

@ 25 º

< 27 cc

 

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