Intergrowth Family STF-SFF

Periodic Building Unit


Periodic Building Unit (PerBU):	STF layer

Layer symmetry	P 2

2D cell parameters	a = 11.45 Å	b = 7.23 Å	gamma = 93°

References
	Villaescusa, L.A., Zhou, W., Morris, R.E. and Barrett, P.A.
		"Synthesis, characterization and control of faulting in STF/SFF topologies, a new family of intergrowth zeolites"
		J. Mater. Chem., 14, 1982-1987 (2004)
	Villaescusa, L.A., Zhou, W., Morris, R.E. and Barrett, P.A.
		"Synthesis, characterization and control of faulting in STF/SFF topologies, a new family of intergrowth zeolites"
		J. Mater. Chem., 14, 1982-1987 (2004)

Connectivity pattern

Examples

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

Symmetry Operation^*	Translation^*	Comment	Image
i	None	one inversion center shown as an open circle in the example
m	None	mirror plane shown as a soid line in the example

^* relative to the first layer


Effect on channel system
	The disorder does not block the 1-dimensional 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).

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Polymorph STF

Cell Parameters:	monoclinic	C 1 2/m 1: (# 12)
	a = 14.1040 Å	b = 18.2050 Å	c = 7.4770 Å
	α = 90.000°	β = 98.989°	γ = 90.000°
	Volume =	1896.3 Å³
Framework Density (FD_Si):	16.9

	Ring sizes (# T-atoms):	10 6 5 4
	Channel dimensionality:	Topological (pore opening > 6-ring): 1-dimensional

Maximum diameter of a sphere:
	that can be included	7.63 Å
	that can diffuse along	a: 1.57 Å	b: 1.26 Å	c: 5.44 Å
		addional volume data

Composite Building Units:


	stf		cas

In this space group and setting, the PerBUs are stacked along [-110]
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 STF

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Polymorph SFF

Cell Parameters:	monoclinic	P 1 2₁/m 1: (# 11)
	a = 11.4540 Å	b = 21.6950 Å	c = 7.2270 Å
	α = 90.000°	β = 93.154°	γ = 90.000°
	Volume =	1793.2 Å³
Framework Density (FD_Si):	17.8

	Ring sizes (# T-atoms):	10 6 5 4
	Channel dimensionality:	Topological (pore opening > 6-ring): 1-dimensional

Maximum diameter of a sphere:
	that can be included	7.59 Å
	that can diffuse along	a: 1.63 Å	b: 1.37 Å	c: 5.34 Å
		addional volume data

Composite Building Units:


	stf		cas

In this space group and setting, the PerBUs are stacked along [010]
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 SFF