Synthesis, Electrochemical, and Thermal Properties of [3]Ferrocenophane-Containing Chalcone Derivatives

[3]Ferrocenophane-containing chalcone derivatives with benzene ring (3a–3d) or naphthalene ring (3e–3f) were synthesized and characterized. The potentials for [3]ferrocenophane-containing chalcones cathodically shifted ~70–80 mV compared with those of ferrocene-containing chalcones, indicating easier oxidation by loss of an electron for the former. The thermal behaviours of the prepared compounds were studied by differential scanning calorimetry and polarizing optical microscopy. Compound 3f with terminal alkyl chain of 14 carbon atoms displayed mesophases, whereas other compounds were non-mesomorphic and showed either crystal polymorphic phase transitions or simple melting and freezing process in the heating and cooling cycles.

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Synthesis and mesogenic properties of β-tetrabrominated tetraalkyloxyporphyrins

Journal of Porphyrins and Phthalocyanines ◽

10.1142/s108842460800008x ◽

2008 ◽

Vol 12 (01) ◽

pp. 54-64 ◽

Cited By ~ 4

Author(s):

Puttaiah Bhyrappa ◽

Chellaiah Arunkumar ◽

Babu Varghese ◽

Doddamane S. Shankar Rao ◽

Subbarao K. Prasad

Keyword(s):

Crystal Structure ◽

Differential Scanning Calorimetry ◽

Melting Point ◽

Optical Microscopy ◽

Alkyl Chain ◽

Alkyl Chain Length ◽

Scanning Calorimetry ◽

Point Temperature ◽

New Class ◽

Clearing Point

A new class of 2,3,7,8-tetrabromo-5,10,15,20-tetrakis(4'-n-1-alkyloxyphenyl)porphyrins, H 2 T (4'- OC n P ) PBr 4 (n = 4,6,8,10,12,14,16 and 18) and their Cu(II) complexes have been synthesized regioselectively and their mesophase properties explored. The mesogenic properties of the porphyrins were examined by differential scanning calorimetry and optical microscopy. An increase in alkyl chain length of the mesogens, showed an increase in melting point temperature and lowering of their clearing point temperatures with the narrower mesophases. This has been ascribed to the decreased π-π interactions as evidenced from the crystal structure of H 2 T (4'- OC 6 P ) PBr 4· THF derivative. MT (4'- OC n P ) PBr 4 derivatives showed rectangular mesophases in contrast to discotic lamellar mesophases reported for the planar MT (4'- OC n P ) P mesogens.

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Influence of Cooling Rates on Phase Transitions of Bent-Core Liquid Crystal 1,3-Phenylene-bis[4-(hexylcarboyloxyl)benzylideneamine]

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.428-429.247 ◽

2010 ◽

Vol 428-429 ◽

pp. 247-250 ◽

Cited By ~ 1

Author(s):

Yuan Ming Huang ◽

Qing Lan Ma ◽

Bao Gai Zhai

Keyword(s):

Differential Scanning Calorimetry ◽

Phase Transitions ◽

Liquid Crystal ◽

Optical Microscopy ◽

Cooling Rate ◽

Scanning Calorimetry ◽

Slow Cooling ◽

Cooling Rates ◽

Polarized Optical Microscopy ◽

Fast Cooling

The influence of cooling rate on the phase transitions of a three-benzene-ring containing bent-core liquid crystal 1,3-phenylene-bis[4-(hexylcarboyloxyl)benzylideneamine] has been investigated by means of differential scanning calorimetry and polarized optical microscopy. Our results show that the cooling rates in the second cooling run pose significant effects on the phase transitions of the bent-core liquid crystal despite the cooling rates in the first cooling run pose little effects on the phase transitions. In the second cooling run, the banana phases survived only when the cooling rates were in the range of 14~15oC/min whereas both slow cooling rates which were less than 13oC/min and fast cooling rates which were higher than 16oC/min made the banana phases disappeared.

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Photopyroelectric Calorimeter for Phase Transitions Monitoring: Application to Chocolate

MRS Proceedings ◽

10.1557/proc-1242-s4-p17 ◽

2009 ◽

Vol 1242 ◽

Author(s):

E. I. Martínez-Ordoñez ◽

E. Marín ◽

J. A. I. Díaz-Góngora ◽

A. Calderón

Keyword(s):

Differential Scanning Calorimetry ◽

Thermal Properties ◽

Phase Transitions ◽

Materials Science ◽

Scanning Calorimetry ◽

Characterization Of Materials ◽

Thermophysical Characterization ◽

Monitoring Application ◽

Differential Scanning Calorimetry Technique

ABSTRACTIn this work we report about the design and construction of a simple and cheap calorimeter for phase transitions monitoring using Peltier elements and based in the well known inverse (front) photopyroelectric method for thermophysical characterization of materials. We describe its application for the detection of phase transitions in chocolate samples, as an alternative, for example, to the most widely used and more expensive Differential Scanning Calorimetry technique. The manufacture of chocolate requires an understanding of the chemistry and the physical properties of the product. Thus the involved problems during the confection process are those of the so-called materials science. Among them, those related with tempering are of particular importance. Because the fats in cocoa butter experience the so-called polymorphous crystallization, the primary purpose of tempering is to assure that only the best form is present in the final product. One way to characterize this is by measurement of the temperature dependence of the thermal properties of the chocolate and the monitoring of the temperature at which phase transitions take place. We show that the photopyroelectric method, aided with Peltier cells temperature control, can be a useful choice for this purpose.

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Characterization, liquid crystallinity and spin-coated films of some metalated 1,4,8,11,15,18,22,25-octaalkyl tetrabenzo [b,g,l,q][5,10,15]triazaporphyrin derivatives

Journal of Porphyrins and Phthalocyanines ◽

10.1142/s1088424611003793 ◽

2011 ◽

Vol 15 (09n10) ◽

pp. 890-897 ◽

Cited By ~ 12

Author(s):

Andrew N. Cammidge ◽

Isabelle Chambrier ◽

Michael J. Cook ◽

Ernie H.G. Langner ◽

Muhibur Rahman ◽

...

Keyword(s):

Differential Scanning Calorimetry ◽

Optical Microscopy ◽

Alkyl Chain ◽

Bulk Material ◽

Polarized Light ◽

Scanning Calorimetry ◽

Liquid Crystallinity ◽

Derivatives Of ◽

Deposited Films

The preparation and characterization of a number of metalated derivatives of 1,4,8,11,15,18,22,25-octahexyl and 1,4,8,11,15,18,22,25-octadecyl tetrabenzotriazaporphyrins (TBTAPs) are reported. The mesophase behavior of the compounds has been characterized by differential scanning calorimetry (DSC) and by polarized light optical microscopy. Mesophase behavior is compared with data for the corresponding phthalocyanine derivatives reported earlier. The temperature range of the mesophase(s) exhibited by the title compounds is generally broader than those of their phthalocyanine analogs. UV-vis data for examples of the TBTAP compounds as spin-coated films reveal differences in the type of molecular packing in the as-deposited films that is largely dependent upon the length of the alkyl chain substituents. On heating, the films undergo molecular reorganizations at temperatures corresponding to the mesophase transitions of bulk material observed by DSC.

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Hexabenzocoronene with Swallow-Tailed Substitutes: Synthesis, Characterization and Properties

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.181-182.147 ◽

2011 ◽

Vol 181-182 ◽

pp. 147-150 ◽

Cited By ~ 1

Author(s):

Wen Qing Huang ◽

Pei Pei Liu ◽

Bing Bing Wang ◽

Xu Ying Liu ◽

Wen Guang Wang

Keyword(s):

Differential Scanning Calorimetry ◽

Thermal Properties ◽

Optical Microscopy ◽

Thermal Processing ◽

Self Organization ◽

Side Chains ◽

Scanning Calorimetry ◽

Polarized Optical Microscopy ◽

Alkyl Chains

A hexa-peri-hexabenzocoronene (HBC) derivative, substituted at periphery by six swallow-tailed alkyl chains containing ether linkages, has been synthesized. Its thermal properties and self-organization were investigated using differential scanning calorimetry (DSC) and polarized optical microscopy (POM). Results showed that the peripheral side chains substituted to the aromatic core could lead the HBC to a dramatically lowered isotropization temperature compared with those reported previously, allowing thermal processing at practical temperatures.

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1-Octyl-3-(3-(1-methylpyrrolidiniumyl)propyl)imidazolium Bis(trifluoromethane)sulfonimide

Molbank ◽

10.3390/m1089 ◽

2019 ◽

Vol 2019 (4) ◽

pp. M1089

Author(s):

Andrea Mezzetta ◽

Christian S. Pomelli ◽

Felicia D’Andrea ◽

Lorenzo Guazzelli

Keyword(s):

Differential Scanning Calorimetry ◽

Ionic Liquid ◽

Thermal Properties ◽

Infrared Spectroscopy ◽

Alkyl Chain ◽

Metathesis Reaction ◽

Scanning Calorimetry ◽

Head Groups ◽

Dicationic Ionic Liquid ◽

Positively Charged

The title compound 1-octyl-3-(3-(1-methylpyrrolidiniumyl)propyl)imidazolium bis(trifluoromethane)sulfonimide was prepared in three steps. This asymmetrical dicationic ionic liquid (ADIL) is composed of two different positively charged head groups (1-octylimidazolium and methylpyrrolidinium cations), which are linked through a propyl alkyl chain and by two bis(trifluoromethane)sulfonimide anions. The final ADIL was obtained by a simple metathesis reaction of the corresponding dibromide ionic liquid, in turn prepared by alkylation of 3-(3-bromopropyl)-1-propylimidazolium bromide. The ADIL structure and those of its precursors were confirmed through NMR and infrared spectroscopy, and the thermal properties of all compounds were evaluated by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). Density, solubility, and viscosity were measured for the prepared compounds.

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Synthesis and Mesomorphic Properties of Three-Ring Containing Bent-Core Liquid Crystal 1,3-Phenylene-bis(4-butoxybenzylideneamine)

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.428-429.167 ◽

2010 ◽

Vol 428-429 ◽

pp. 167-170

Author(s):

Yuan Ming Huang

Keyword(s):

Differential Scanning Calorimetry ◽

Liquid Crystal ◽

Optical Microscopy ◽

Cyclic Heating ◽

Scanning Calorimetry ◽

Polarized Optical Microscopy ◽

Temperature Range ◽

Heating And Cooling ◽

Mesomorphic Properties

A three-ring containing bent-core compound 1,3-phenylene-bis(4-butoxybenzylidene amine) was synthesized and characterized with differential scanning calorimetry and polarized optical microscopy. It exhibited mesophases in the temperature range of 48-54oC for the first cyclic heating and cooling. Our results demonstrated that three-ring containing bent-core molecules can form mesophases.

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Synthesis and Phase Behavior of a New Thiophene Monomer as Nematic Liquid Crystal

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.989-994.185 ◽

2014 ◽

Vol 989-994 ◽

pp. 185-188

Author(s):

Lin Wang ◽

Yu Jiao Xie ◽

Xing Xing Zhang ◽

Jian She Hu

Keyword(s):

Differential Scanning Calorimetry ◽

Liquid Crystal ◽

Phase Behavior ◽

Optical Microscopy ◽

Nematic Liquid Crystal ◽

Chemical Structure ◽

Scanning Calorimetry ◽

H Nmr ◽

Heating And Cooling ◽

Ft Ir

The synthesis of a new liquid crystal thiophene monomer of (E)-4-(6-(3-(thiophen-3-yl)- acryloyloxy) hexyloxy) biphenyl-4’-ethylbenzoate (LC-M) is presented. The chemical structure of this monomer and intermediate compounds was characterized by FT-IR and1H-NMR. The phase behavior was investigated by polarizing optical microscopy and differential scanning calorimetry. LC-M showed nematic threaded and schlieren textures on heating and cooling cycles.

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Improved Processing and Properties for Polyphenylene Oxide Modified by Diallyl Orthophthalate Prepolymer

Polymers ◽

10.3390/polym11122016 ◽

2019 ◽

Vol 11 (12) ◽

pp. 2016

Author(s):

Honghua Wang ◽

Qilin Mei ◽

Yujie Ding ◽

Zhixiong Huang ◽

Minxian Shi

Keyword(s):

Differential Scanning Calorimetry ◽

Thermal Properties ◽

Phase Separation ◽

Dilution Effect ◽

Gradual Decrease ◽

Gel Point ◽

Dynamic Mode ◽

Curing Process ◽

Scanning Calorimetry ◽

Polyphenylene Oxide

Diallyl orthophthalate (DAOP) prepolymer was investigated as a reactive plasticizer to improve the processability of thermoplastics. The rheology of blends of DAOP prepolymer initiated by 2,3-dimethyl-2,3-diphenylbutane (DMDPB) and polyphenylene oxide (PPO) was monitored during the curing process, and their thermal properties and morphology in separated phases were also studied. Differential scanning calorimetry (DSC) results showed that the cure degree of the reactively plasticized DAOP prepolymer was reduced with increasing PPO due to the dilution effect. The increasing amount of the DAOP prepolymer led to a gradual decrease in the viscosity of the blends and the rheology behavior was consistent with the chemical gelation of DAOP prepolymer in blends. This indicated that the addition of the DAOP prepolymer effectively improved processability. The phase separation occurring during curing of the blend and the transition from the static to dynamic mode significantly influences the development of the morphology of the blend corresponding to limited evolution of the conversion around the gel point.

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