pauls compounds1
TRANSCRIPT
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.
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
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)
27 ℃ Crystal Phase
Si2K11PO* Chemical Formula: C35H62N2O2Si2
X-ray diffraction confirms crystal phase. No LC phase for this compound.
Si3K11PB Chemical Formula: C35H62N2O2Si3
Si Si SiO
N
N
O
54.1 SmA℃ 35 ℃ SmC or Crystal?
Optical Textures
3.
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.
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.