Database of Zeolite Structures
 

Framework Type EWS
Reference Material
  Material Name: EMM-26    
 
Chemical Formula:
 
|(MPH+2)4 H2O | [Si88B8O192]-EWS
MPH+2 = C16H34N2+2
= 1-methyl-1-[6-(1-methylpyrrolidin-1-ium-1-yl)hexyl]pyrrolidin-1-ium
SMILES: C[N+]1(CCCC1)CCCCCC[N+]2(CCCC2)C   Images:  stick or 3D
 
   
Unit Cell:
 
orthorhombic

 C m c a (# 64)
    a' = 19.3918 Å b' = 15.7008 Å c' = 17.7673 Å  
    α' = 90.000° β' = 90.000° γ' = 90.000°  
   
Framework Density:
 
17.7 T/1000 Å3
 
 
Channels:
 
[010] 10 3.6 x 6.6* <-> [010] 10 3.6 x 6.6*
Dimensionality
  Sorption (molecular cross section > 3.4Å): 2-dimensional
  Topological (pore opening > 6-ring): 2-dimensional
    Note:
The plane of these two rings are tilted approx. +15 and -15 degrees from [010], respectively
   
References:
  Guo, P., Strohmaier, K., Vroman, H., Afeworki, M., Ravikovitch, P.I., Paur, C.S., Sun, J., Burton, A. and Zou, X.
  "Accurate structure determination of a borosilicate zeolite EMM-26 with two-dimensional 10x10 ring channels using rotation electron diffraction"
Inorg. Chem. Front. , 3, 1444-1448 (2016)
Limiting Rings
 
10-ring, rotated
+15 degrees from [010]

10-ring, rotated
-15 degrees from [010]