SSZ-33: DO Family

Intergrowth Family SSZ-33

Periodic Building Unit


Periodic Building Unit (PerBU):	CON layer

Layer symmetry	P m m (2)

2D cell parameters	a = 13.30 Å	b = 12.60 Å	gamma = 90°

References
	Lobo, R.F., Pan, M., Chan, I., Li, H.X., Medrud, R.C., Zones, S.I., Crozier, P.A. and Davis, M.E.
		"SSZ-26 and SSZ-33 - 2 Molecular Sieves with Intersecting 10-Ring and 12-Ring Pores"
		Science, 262, 1543-1546 (1993)

Connectivity pattern

Examples

The layers are stacked along the [001] direction using the following connectivity patterns

Symmetry Operation^*	Translation^*	Comment	Image
	1/2 a + 1/3 b
	1/2 a - 1/3 b

^* relative to the previous layer


Effect on channel system
	The disorder does not block the channel system

Simplest ordered end members

The color of each layer reflects the symmetry/translation operation used to generate it from the previous layer (see table above).


Polymorph SSZ-33_A

Cell Parameters:	orthorhombic	P m n a: (# 53)
	a = 13.3026 Å	b = 12.5934 Å	c = 21.3123 Å
	α = 90.0000°	β = 90.0000°	γ = 90.0000°
	Volume =	3570.3 Å³
Framework Density (FD_Si):	15.7

	Ring sizes (# T-atoms):	12 10 6 5 4
	Channel dimensionality:	Topological (pore opening > 6-ring): 3-dimensional

Maximum diameter of a sphere:
	that can be included	7.13 Å
	that can diffuse along	a: 4.9 Å	b: 5.98 Å	c: 4.9 Å
		[0 1 0] : 5.98 Å
		addional volume data

Composite Building Units:


bea	bre	mel

In this space group and setting, the PerBUs are stacked along [001]

	Note: This polymorph has NOT been observed as a pure ordered material


Polymorph SSZ-33_B

Cell Parameters:	monoclinic	C 1 2/m 1: (# 12)
	a = 22.6840 Å	b = 13.3730 Å	c = 12.5530 Å
	α = 90.000°	β = 69.479°	γ = 90.000°
	Volume =	3566.3 Å³
Framework Density (FD_Si):	15.7

	Ring sizes (# T-atoms):	12 10 6 5 4
	Channel dimensionality:	Topological (pore opening > 6-ring): 3-dimensional

Maximum diameter of a sphere:
	that can be included	7.45 Å
	that can diffuse along	a: 4.89 Å	b: 4.89 Å	c: 5.6 Å
		addional volume data

Composite Building Units:


bea	bre	lau	mel

In this space group and setting, the PerBUs are stacked along [100]
Adjacent layers generated by the same connectivity pattern (same basic color) are shown with different shades for clarity.

	Note: This polymorph corresponds to the ordered framework CON