bnseries_textures

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Bhowmik Compounds

Bn Series

Optical Microscopy : Mike FischX-ray Diffraction: Lee Sharpnack and Tyler Harris

Funding: NSF US Ireland R&D Partnership under Award # 1410649

Acknowledgments:

Compound Phase Transition/Temperature (⁰C)

B12

B13

B14

B15

B16

B17

B18

B19

B20

I Sm A Cr95.6 67.2

I Sm A Cr109 49.2

I Sm A Cr97.5 65.3

I Sm A Cr110.3 49.5

I Sm A Cr97.8 27.2

I Sm A Cr109.5 61.7

I Sm X Cr97.1 31.2

I Sm A Cr108.2 51.7

I Cr56.2

Compound D-spacing (Å)

B12 27.60

B13 28.82

B14 29.74

B15 30.79

B16 31.25

B17 34.11

B18 33.98

B19 -

B20 Crystal

B12Optical Textures

94oC 67.8oC

67.2oC 38.6oC

SmA

SmX

B12

X-ray Diffratction

90 C Sm A⁰ 70 C Crystal⁰

X-ray Diffraction confirms Smectic A phase.

B13Optical Textures

108oC 90oC 80oC

78.2oC 55oC 50.2oC

SmA SmX

Crystal?

55oC

B13X-ray Diffraction

108 C Sm A⁰ 86 C Sm A⁰ 82 C Sm A⁰

B13X-ray Diffraction

58 C Crystal⁰78 C Sm A⁰

X-ray Diffraction confirms Smectic A phase.

B14Optical Textures

93.6oC 66.3oC

65.3oC

SmX

SmA

B14X-ray Diffraction

96.5 C Sm A⁰ 67 C Crystal⁰

X-ray Diffraction confirms Smectic A phase.

B15Optical Textures

104oC 74oC

55oC 49.9oC

SmA

Crystal

B15X-ray Diffraction

110 C Sm A⁰ 70 C Sm A⁰

B15X-ray Diffraction

60 C Sm A⁰ 50 C Crystal?⁰

X-ray Diffraction confirms Smectic A phase.

B16Optical Textures

96.8oC 70oC

65.5oC 34.7oC

SmA

SmC

B16X-ray Diffraction

96 C Sm A⁰ 74 C Sm A⁰ 63 C Crystal⁰

X-ray Diffraction confirms Smectic A phase. No Smectic C phase found in this compound

B17Optical Textures

105oC 94.6oC 93.6oC

90oC 65.7oC 61.7oC

SmA

CrystalSmX

B17

X-ray diffraction

109⁰C Sm A 100 C Sm A⁰ 90 C Sm A⁰

B17

X-ray diffraction

70 C Sm A⁰ 60 C Crystal⁰

X-ray Diffraction confirms Smectic A phase.

B18Optical Textures

90oC 70oC

64.7oC 33.4oC

SmA SmA

SmC? Crystal

B18X-ray Diffraction

96 C Sm A⁰ 70 C Sm A⁰

B18X-ray Diffraction

65 C Sm A⁰ 31.2 C Crystal?⁰X-ray Diffraction confirms Smectic A phase.

B19Optical Textures

106oC 60oC

60oC pol 30o 51.7oC

Crystal

SmA

B20Optical Textures

56.2oC59.3oC

Crystal

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