Solid phase
Official name
Ammonium tetrathiomolybdate
Secondary names
Ammonium thiomolybdate; Tiomolibdate diammonium; diazanium;bis(sulfanylidene)molybdenum;sulfanide; H10MoN2S4
CAS number
15060-55-6
Type
Family
ionic solid
Class
alkali salt
Compound type
molybdate
Chemical composition
Formula
$(NH_4^+)_2 \cdot (MoS_4)^{2-}$
Chemical formula
(NH4)2.MoS4
Elemental formula
(N+)2 H8 Mo S2 (S-)2
Isotope mixture type
terrestrial abundance
6.0
  Formula Name Family Number min-max Mole fraction Isotope mole fraction State Relevance
$NH_4^+$ Ammonium ion molecule 2 0.6666666666666666 1 molecular ion main
$MoS_4^{2-}$ Tetrathiomolybdate molecule 1 0.3333333333333333 1 molecular ion main
Chemical functions
  Function Number
$H_4 >\mid N^+$ 1
$(MoS_4)^{2-}$ 1
Chemical bonds
  Bond Number
$>\mid N^{+} \cdot S^{-}-$ 2
$\geq N^+-H$ 4
$\geqq Mo=S$ 2
$\gg Mo-S^{-}$ 2
$\dddot - \dddot - \dddot - Mo \dddot - S^{-1/2}$ 4
Class
alkali salts (06)
Type
simple alkali salts (06.01)
Phase type
crystalline
Crystal system
orthorhombic
Crystal class
dipyramidal
Crystal class symbol
mmm (D2h)
Crystal spacegroup
Pnma
Molar mass
260.28 $g/mol$
State NTP
solid
Phase transitions
Phase transition type Other phases Temperature - Pressure
solid-liquid decomposition > ~155°C (> ~428 K)
Refringence type
biaxial
Pure color
red
Color
red
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