pauls compounds1

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Compound Name Molecular Structure Phases/ Transition Temperatures ( o C) 1. Si3K11PO* Isotropic at room temperature 2. Si2K11PO* 3. Si3K11PB 4. Si3K11PN SUMMARY See details of optical microscopy and x-ray diffraction in the next pages. Si Si O N N O Si Si Si O N N O Si Si Si O N N O Si Si Si O N N O

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Page 1: PaulS compounds1

Compound Name

Molecular Structure Phases/TransitionTemperatures (oC)

1. Si3K11PO* Isotropic at room temperature

2. Si2K11PO*

3. Si3K11PB

4. Si3K11PN

Si SiO

N

N

O

Si Si SiO

N

N

O

Si Si Si O

N

N

O

Si Si SiO

N

N

O

SUMMARY

See details of optical microscopy and x-ray diffraction in the next pages.

Page 2: PaulS compounds1

Si Si SiO

N

N

O

Si3K11PO* Chemical Formula: C38H70N2O2Si3

Isotropic at ambient temperature. No Liquid Crystalline phase.

1.

All optical microscopy and x-ray diffraction measurements were done at Kumar laboratory by Tyler Harris (summer intern student), 2015

Page 3: PaulS compounds1

Isotropic at ~33 oC

Si SiO

N

N

O

Si2K11PO* Chemical Formula: C35H62N2O2Si22.

Optical Textures

27.5 ℃ Sm? Or Crystal? (Heating) 25.9 Sm℃ or Crystal? (Cooling)

Page 4: PaulS compounds1

27 ℃ Crystal Phase

Si2K11PO* Chemical Formula: C35H62N2O2Si2

X-ray diffraction confirms crystal phase. No LC phase for this compound.

Page 5: PaulS compounds1

Si3K11PB Chemical Formula: C35H62N2O2Si3

Si Si SiO

N

N

O

54.1 SmA℃ 35 ℃ SmC or Crystal?

Optical Textures

3.

Page 6: PaulS compounds1

Si3K11PB Chemical Formula: C35H62N2O2Si3

X-ray Diffraction

65 SmA℃ 50 SmA℃ 35 ℃ Crystal

d ~ 45 Angstrom

X-ray diffraction confirms Smectic A phase. No SmC phase found for this compound.

Page 7: PaulS compounds1

Si3K11PN Chemical Formula: C39H72N2O2Si3

Si Si Si O

N

N

O

64.4℃ Sm? 65℃ Cr, cooling

X-ray diffraction confirms crystal phase below isotropic temperature (67oC). No LC phase was found for this compound.

4.