Database of Zeolite Structures
 

Framework Type EMT
Reference Material
  Material Name: EMC-2    
 
Chemical Formula:		  
|Na20 (18-crown-6)4 (H2O)58| [Al20Si76O192]-EMT
18-crown-6 = C12H24O6 = 18-crown-6 ether
= 1,4,7,10,13,16-hexaoxacyclooctadecane
SMILES: C1COCCOCCOCCOCCOCCO1   Images:  stick or 3D		  
   
Unit Cell:§ 		 
hexagonal
 P 63/m m c (# 194)
    a' = 17.3740 Å b' = 17.3740 Å c' = 28.3650 Å  
    α' = 90.000° β' = 90.000° γ' = 120.000°  
   
Framework Density: 		 
12.9 T/1000 Å3
 
  
Channels: 		 
[001] 12 7.3 x 7.3* <-> [001] 12 6.5 x 7.5**
Dimensionality
  Sorption (molecular cross section > 3.4Å): 3-dimensional
  Topological (pore opening > 6-ring): 3-dimensional
   
References:
  Delprato, F., Delmotte, L., Guth, J.L. and Huve, L.
  "Synthesis of new silica-rich cubic and hexagonal faujasites using crown-ether-based supramolecules as templates"
Zeolites, 10, 546-552 (1990)
Material name:   EMC-2
Chemical formula:   [Al21Si75O192]-EMT
  § Baerlocher, Ch., McCusker, L.B. and Chiappetta, R.
  "Location of the 18-crown-6 template in EMC-2 (EMT). Rietveld refinement of the calcined and as-synthesized forms"
Microporous Materials, 2, 269-280 (1994)
 
  
Name and Code derivation:
    Elf (or Ecole Supérieure) Mulhouse Chimie - two
  EMC-2 (two)
  EMT
 
 
§ Chemical Formula and Unit Cell taken from the reference marked with this sign
Limiting Rings
 
12-ring viewed along [001]

12-ring viewed normal to [001]


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