Evaluation of Physicochemical Properties of Amphiphilic 1,4-Dihydropyridines and Preparation of Magnetoliposomes

This study was focused on the estimation of the targeted modification of 1,4-DHP core with (1) different alkyl chain lengths at 3,5-ester moieties of 1,4-DHP (C12, C14 and C16); (2) N-substituent at position 1 of 1,4-DHP (N-H or N-CH3); (3) substituents of pyridinium moieties at positions 2 and 6 of 1,4-DHP (H, 4-CN and 3-Ph); (4) substituent at position 4 of 1,4-DHP (phenyl and napthyl) on physicochemical properties of the entire molecules and on the characteristics of the obtained magnetoliposomes formed by them. It was shown that thermal behavior of the tested 1,4-DHP amphiphiles was related to the alkyl chains length, the elongation of which decreased their transition temperatures. The properties of 1,4-DHP amphiphile monolayers and their polar head areas were determined. The packing parameters of amphiphiles were in the 0.43–0.55 range. It was demonstrated that the structure of 1,4-DHPs affected the physicochemical properties of compounds. “Empty” liposomes and magnetoliposomes were prepared from selected 1,4-DHP amphiphiles. It was shown that the variation of alkyl chains length or the change of substituents at positions 4 of 1,4-DHP did not show a significant influence on properties of liposomes.

Download Full-text

Molecular Mimicry and Assemblies of Asymmetric Organic Semiconductors

10.21203/rs.3.rs-273112/v1 ◽

2021 ◽

Author(s):

Craig Yu ◽

Shohei Kumagai ◽

Michitsuna Tsutsumi ◽

Tadanori Kurosawa ◽

Hiroyuki Ishii ◽

...

Keyword(s):

Organic Semiconductors ◽

Alkyl Chain ◽

Molecular Mimicry ◽

Design Feature ◽

Molecular Assembly ◽

Large Area ◽

Alkyl Chains ◽

Synthetic Strategy ◽

Chain Lengths ◽

High Degree

Abstract Molecular assembly is a crucial factor for charge transports in organic semiconductors (OSCs), and molecularly flexible alkyl chain substitution is a key design feature for achieving desired molecular assemblies. However, the high degree of freedom of alkyl chains leads to molecular fluctuations that are detrimental to OSC performances. Stabilization of alkyl chains via intermolecular interactions in packing structures exists in biological and materials systems, and such a strategy can be harnessed in OSCs to suppress molecular fluctuations. Here, we present a robust synthetic strategy for a series of asymmetric n-type benzo[de]isoquinolino[1,8-gh]quinolinetetracarboxylic diimide (BQQDI) OSCs with various alkyl chain lengths, and certain alkyl chains exhibit an unusual molecular mimicry with energetically favorable gauche conformer that shows isomorphic structures and small molecular fluctuations. Asymmetric n-type OSC with the optimum chain length exhibits satisfactory solubility, excellent electron mobility, and large-area single-crystalline thin films are fabricated for practical organic electronics.

Download Full-text

The effect of alkyl chain lengths on the red-to-near-infrared emission of boron-fused azomethine conjugated polymers and their film-state stimuli-responsivities

Polymer Chemistry ◽

10.1039/d1py00213a ◽

2021 ◽

Author(s):

Shunsuke Ohtani ◽

Natsumi Yamada ◽

Masayuki Gon ◽

Kazuo Tanaka ◽

Yoshiki Chujo

Keyword(s):

Conjugated Polymers ◽

Near Infrared ◽

Alkyl Chain ◽

Infrared Emission ◽

Stimuli Responsive ◽

Alkyl Chains ◽

Chain Lengths ◽

Near Infrared Emission ◽

Film State ◽

Conjugated Copolymers

We present systematic studies of the dependence of the red-to-near-infrared emission and stimuli-responsive properties of boron-fused azomethine conjugated copolymers on the lengths of the alkyl chains.

Download Full-text

Dithiafulvenyl–triphenylamine organic dyes with alkyl chains for efficient coadsorbent-free dye-sensitized solar cells

RSC Advances ◽

10.1039/c5ra06774j ◽

2015 ◽

Vol 5 (63) ◽

pp. 50813-50820 ◽

Cited By ~ 21

Author(s):

Zhongquan Wan ◽

Chunyang Jia ◽

Yan Wang ◽

Xiaojun Yao

Keyword(s):

Solar Cells ◽

Alkyl Chain ◽

Organic Dyes ◽

Dye Sensitized Solar Cells ◽

Alkyl Chains ◽

Dye Sensitized ◽

Chain Lengths ◽

Sensitized Solar Cells

Dithiafulvenyl–triphenylamine (DTF–TPA) based D-D-η-A organic dyes with different alkyl chains attached on the DTF unit were synthesized to investigate the effect of alkyl chain lengths on the photovoltaic performances of dye-sensitized solar cells.

Download Full-text

Alkyl-chain disorder in tetraisohexylammonium bromide

Acta Crystallographica Section C Crystal Structure Communications ◽

10.1107/s0108270112009377 ◽

2012 ◽

Vol 68 (4) ◽

pp. o152-o155 ◽

Cited By ~ 2

Author(s):

Malcolm A. Kelland ◽

Amber L. Thompson

Keyword(s):

Crystal Structure ◽

Crystal Growth ◽

Alkyl Chain ◽

Growth Inhibitor ◽

Ammonium Cation ◽

Asymmetric Unit ◽

Bromide Anion ◽

Alkyl Chains ◽

Hydrate Crystal ◽

Structure Ii Clathrate Hydrate

Tetraisohexylammonium bromide [systematic name: tetrakis(4-methylpentyl)azanium bromide], C24H52N+·Br−, is a powerful structure II clathrate hydrate crystal-growth inhibitor. The crystal structure, in the space groupP3221, contains one ammonium cation and one bromide anion in the asymmetric unit, both on general positions. At 100 K, the ammonium cation exhibits one ordered isohexyl chain and three disordered isohexyl chains. At 250 K, all four isohexyl chains are disordered. In an effort to reduce the disorder in the alkyl chains, the crystal was thermally cycled, but the disorder remained, indicating that it is dynamic in nature.

Download Full-text

Facile construction of a family of supramolecular gels with good levofloxacin hydrochloride loading capacity

RSC Advances ◽

10.1039/d1ra00809a ◽

2021 ◽

Vol 11 (21) ◽

pp. 12641-12648

Author(s):

Renyuan Chen ◽

Caidie Xu ◽

Yihao Lei ◽

Hongxin Liu ◽

Yabin Zhu ◽

...

Keyword(s):

Molecular Weight ◽

Alkyl Chain ◽

Low Molecular Weight ◽

Loading Capacity ◽

Supramolecular Gels ◽

Low Molecular Weight Gelators ◽

Chain Lengths

A family of low molecular weight gelators with different alkyl chain lengths was constructed, having excellent gelation ability and antibiotic loading capacity. A low molecular weight hydrogelator was obtained by adjusting the length of alkyl chain.

Download Full-text

Thermal, ferroelastic, and structural properties near phase transitions of organic–inorganic perovskite type [NH3(CH2)3NH3]CdBr4 crystals

RSC Advances ◽

10.1039/d1ra02045e ◽

2021 ◽

Vol 11 (29) ◽

pp. 17622-17629

Author(s):

Ae Ran Lim

Keyword(s):

Phase Transition ◽

Phase Transitions ◽

Thermal Behavior ◽

Structural Properties ◽

Structural Dynamics ◽

Transition Temperatures ◽

Inorganic Perovskite ◽

Phase Transition Temperatures ◽

Perovskite Type

We studied the thermal behavior and structural dynamics of [NH3(CH2)3NH3]CdBr4 near phase transition temperatures.

Download Full-text

Effects of Reduced Nitrogen Fertilization and Irrigation on Structure and Physicochemical Properties of Starch in Two Bread Wheat Cultivars

Agriculture ◽

10.3390/agriculture11010026 ◽

2021 ◽

Vol 11 (1) ◽

pp. 26

Author(s):

Jingyang Tong ◽

Shujun Wang ◽

Zhonghu He ◽

Yan Zhang

Keyword(s):

Physicochemical Properties ◽

Bread Wheat ◽

Short Range ◽

N Fertilization ◽

Wheat Starch ◽

Transition Temperatures ◽

Starch Granules ◽

Relative Crystallinity ◽

Swelling Power ◽

Use Efficiency

Nitrogen (N) fertilization and irrigation are significant agronomic factors affecting wheat production, but little information is available on the effects of reduced N fertilization and irrigation on internal starch structure and physicochemical properties associated with the quality of wheat-based foods. In this study, reduced N fertilization and irrigation were separately applied to investigate their effects on composition and morphological changes, crystalline and external region structure features, swelling power, and gelatinization characteristics of starch granules in bread wheat, with a high N-use-efficiency and water-saving wheat cultivar Zhongmai 175 and a widely grown cultivar Jingdong 17. Compared with a non-N control, reduced N fertilization did not change the crystallinity type and short-range ordered degree of starch; however, it significantly increased relative crystallinity, swelling power and gelatinization enthalpy, whereas amylose content and transition temperatures were decreased. Under reduced irrigation, more small starch granules with compact arrangements appeared in comparison with non-water control. Relative crystallinity, swelling power and gelatinization enthalpy of starch were increased, whereas short-range ordered degree and transition temperatures were decreased. Moreover, the starch of the two cultivars appeared to differ in response to both the N and water treatments. The findings indicated that reduced N fertilization or irrigation markedly influenced the structure and physicochemical characteristics of wheat starch, providing important information for developing elite cultivars with high N and water use efficiency and outstanding starch quality.

Download Full-text