The synthesis and crystal structure of a new thiophene monomer containing an additional rhodanine heterocycle are reported. The crystal packing is sustained by N—H⋯O, C—H⋯O, C—H⋯S and C—H⋯π interactions.
The content of this paper focuses/shed light on the effects of X (X = S in P1 and X = O in P2) in C
11
H
7
NSX and R (R = H in P3, R = OCH
3
in P4, and R = Cl in P5) in C
18
H
9
ON
2
S
2
-R on structural features and band gaps of the polythiophenes containing benzo[
d
]thiazole and benzo[
d
]oxazole by the Density Function Theory (DFT) method/calculation. The structural features including the electronic structure lattice constant (a), shape, total energy (E
tot
) per cell, and link length (r), are measured via band gap (E
g
) prediction with the package of country density (PDOS) and total country density (DOS) of material studio software. The results obtained showed that the link angle and the link length between atoms were not changed significantly while the E
tot
was decreased from E
tot
= – 1904 eV (in P1) to E
tot
= – 2548 eV (in P2) when replacing O with S; and the E
tot
of P3 was decreased from E
tot
= – 3348 eV (in P3) when replacing OCH
3
, Cl on H of P3 corresponding to E
tot
= – 3575 eV (P4), – 4264 eV (P5). Similarly, when replacing O in P1 with – S to form P2, the E
g
of P1 was dropped from E
g
= 0.621 eV to E
g
= 0.239 eV for P2. The E
g
of P3, P4, and P5 is E
g
= 0.006 eV, 0.064 eV, and 0.0645 eV, respectively. When a benzo[
d
]thiazole was added in P1 (changing into P3), the E
g
was extremely strongly decreased, nearly 100 times (from E
g
= 0.621 eV to E
g
= 0.006 eV). The obtained results serve as a basis for future experimental work and used to fabricate smart electronic device.
The title compound, C 11 H 7 NS 2 , was prepared in high yield (87%) using a solvent-free microwave-assisted synthesis. The structure shows whole-molecule disorder with occupancies for two orientations (A and B) of 0.4884 (10) and 0.5116 (10), respectively. The thiophene and benzothiazole rings are almost planar and make dihedral angles of 10.02 (18) and 12.54 (19) for orientations A and B, respectively. Slipped -stacking between the aromatic rings, together with C-HÁ Á Á, C-HÁ Á ÁS and C-HÁ Á ÁN interactions, result in a herringbone motif in the crystal packing.
The synthesis and crystal structure of a new thiophene monomer containing a 1,2,4-triazole-5-thione ring are reported. The thiophene and 1,2,4-triazole rings are inclined to each other by 79.70 (9)°.
Measuring customer satisfaction is a key task for hotels today. Analyzing online reviews of experienced guests will help the managers to know if guests are satisfied or dissatisfied with the service that they provided. Hence, they have solutions to improve service quality. This study presents a method to measure guest satisfaction based on sentiment lexicon that is developed for hospitality domain to increase the accuracy of the analysis results. Actual data is downloaded from TripAdvisor with 35 four-star to five-star hotels of five cities in Vietnam to analyze guest satisfaction that shows that nearly 80% of customers are satisfied with the quality of Vietnamese hotels. Based on data analysis, the study also evaluating guest loyalty through phrases like “came here several,” “come back,” “recommend,” etc. This rate corresponds to the number that was reported by the Vietnam National Administration of Tourism.
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