Intergrowth Family MTT-TON

1-dimensional stacking disorder

Periodic Building Unit


Periodic Building Unit (PerBU):	TON layer

Layer symmetry	P 1 m (1)

2D cell parameters	a = 11.38 Å	b = 5.26 Å	gamma = 90°

References
	A. W. Burton, S. I. Zones, T. Rea, I. Y. Chan
		"Preparation and characterization of SSZ-54: A family of MTT/TON intergrowth materials"
		Microporous Mesoporous Mater., 132, 54 – 59 (2010)

Connectivity pattern

Examples

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

Symmetry Operation^*	Translation^*	Comment	Image
2_z		the 2-fold axis along z is located at x=0, y=1/2
	0.23a

^* relative to the previous layer

Alternative description

The relationship between the layers can also be described in terms of a mirror plane m (blue) or an inversion center i (purple), but there is no simple common PerBU for this description (it would require half-occupied T positions), so it has not been used. These symmetry operations are shown in gray in the images on the right.


Effect on channel system
	Disorder does not block the cannels

Simplest ordered end members

The color of each layer reflects the translation operation used to generate it from the previous layer (see Table above)


Polymorph MTT

Cell Parameters:	orthorhombic	P m m n:1 (# 59)
	a = 5.2560 Å	b = 22.0310 Å	c = 11.3840 Å
	α = 90.000°	β = 90.000°	γ = 90.000°
	Volume =	1318.2 Å³
Framework Density (FD_Si):	18.2

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

Maximum diameter of a sphere:
	that can be included	6.19 Å
	that can diffuse along	a: 5.07 Å	b: 2.2 Å	c: 1.53 Å
		addional volume data

Composite Building Units:


jbw	mtt	bik	ton

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 MTT


Polymorph TON

Cell Parameters:	orthorhombic	C m c m: (# 63)
	a = 14.1050 Å	b = 17.8420 Å	c = 5.2560 Å
	α = 90.000°	β = 90.000°	γ = 90.000°
	Volume =	1322.7 Å³
Framework Density (FD_Si):	18.1

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

Maximum diameter of a sphere:
	that can be included	5.71 Å
	that can diffuse along	a: 2.31 Å	b: 1.56 Å	c: 5.11 Å
		addional volume data

Composite Building Units:


jbw	mtt	bik	ton

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 TON

Disorder Example



	Simple example of a random stacking of MTT and TON polymorphs.

	There is no blocking of the 1D channel system.