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REQUIMTE, Chemistry Department, Faculty of Science and Technology, University Nova of Lisbon, 2829-516 Monte de Caparica, Portugal
BIOSCOPE Group, Physical-Chemistry Department, Faculty of Science, Ourense Campus, University of Vigo, 32004, Ourense, Spain
Ecology Research Group, Department of Geographical and Life Sciences, Canterbury Christ Church University, Canterbury, Kent. CT1 1QU, UK
Authors to whom correspondence should be addressed.
Molbank 2012, 2012(3), M768;
Received: 18 June 2012 / Accepted: 31 July 2012 / Published: 6 August 2012


A novel probe L has been synthesized by classical Schiff-base reaction between 1-benzothiophene-3-carbaldehyde and tetraethylenepentamine as diamine. The structure of compound L was confirmed by melting point, elemental analysis, ESI-MS spectrometry, IR and 13C-NMR and 1H-NMR spectroscopy.

Graphical Abstract

The constant and growing interest in the development of new synthetic methods for the preparation of systems involving thiophene subunits is justified by their valuable physiological and pharmacological properties [1,2]. A large number of benzothiophene derivatives have been found to exhibit a wide variety of pharmaceutical properties such as anti-microbial [3], anti-cancer [4], and anti-HIV activity [5].
Since the last five years, our research group has been interested in the introduction of sulphur containing ligands into the skeleton of new fluorescent and colorimetric probes, and new active MALDI-TOF-MS molecules for sensing studies [6,7,8,9,10,11].
This paper describes the synthesis and characterization of a new benzothiophene di-imine probe (L), prepared by simple and classical Schiff-base reaction between 1-benzothiophene-3-carbaldehyde and tetraethylenepentamine (See scheme 1).


A solution of 1-benzothiophene-3-carbaldehyde (0.361 g, 2.108 mmol) in absolute ethanol (25 mL) was added drop wise to a refluxing solution of tetraethylenepentamine (0.199 g, 1.054 mmol) in the same solvent (35 mL). The resulting solution was gently refluxed with magnetic stirring for ca. 4 h. During that period the color changed from yellow to green. The resulting solution was concentrated under vacuum to 1/3 of its original volume. Diethyl ether was added to form a green precipitate that was filtered off and dried under vacuum. The compound isolated was characterized as chemosensor L.
Melting point: 123–125 °C.
Yield: 395 mg (L) (78%).
ESI-MS: m/z (rel. int%): 478.20 (100) [L+H]+.
1H-NMR (CDCl3) (L): δ = 8.2 (s, 2H, C–H)thiophene; 8.0–7.8 (m, 8H, C–H, Ar); 7.2 (s, 2H, N=C–H); 3.8–3.2 (m, 12H, CH2); 2.6–2.2 (m, 4H, CH2); 1.8 (s, 3H, NH) ppm.
13C-NMR (CDCl3) (L): δ = 160.8; 139.9; 127.9; 126.4; 124.4; 124.3; 123.2; 122.8; 119.7; 55.3; 50.2; 49.0.
IR (cm−1) (L): 3036 (C–H, Ar), 1645 (C=N, Imine), 1598, 1493 (C=C, Ar).
Elemental analysis: Calcd for C26H31N5S2·2H2O: C, 60.79; H, 6.87; N,13.63. Found (L): C, 60.95; H, 7.20; N, 13.75.
Uv-vis (CHCl3), [L] = 1.00 ×10−5 M, λmax 287 and 302 nm. Non-emissive.

Supplementary materials

Supplementary File 1Supplementary File 2Supplementary File 3


We are grateful to Xunta de Galicia (Spain) for projects 09CSA043383PR and 10CSA383009PR (Biomedicine) and to the Scientific Association ProteoMass for financial support. C.N. thanks the Fundação para a Ciência e a Tecnologia/FEDER (Portugal/EU) programme postdoctoral contract SFRH/BPD/65367/2009. J.F.L. thanks Xunta de Galicia (Spain) for a research contract by project 09CSA043383PR in Biomedicine. J.L.C. and C.L. thank Xunta de Galicia for the Isidro Parga Pondal Research program.

References and Notes

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Scheme 1. Schematic representation of compound L.
Scheme 1. Schematic representation of compound L.
Molbank 2012 m768 sch001

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MDPI and ACS Style

Núñez, C.; Fernández-Lodeiro, J.; Fernández-Lodeiro, A.; Bértolo, E.; Capelo, J.L.; Lodeiro, C. N1-(Benzo[b]thiophen-3-ylmethylidene)-N2-(2-((2-((2-(benzo[b]thiophen-3-ylmethylidene)amino)ethyl)amino)ethyl)amino)ethyl)ethane-1,2-diamine. Molbank 2012, 2012, M768.

AMA Style

Núñez C, Fernández-Lodeiro J, Fernández-Lodeiro A, Bértolo E, Capelo JL, Lodeiro C. N1-(Benzo[b]thiophen-3-ylmethylidene)-N2-(2-((2-((2-(benzo[b]thiophen-3-ylmethylidene)amino)ethyl)amino)ethyl)amino)ethyl)ethane-1,2-diamine. Molbank. 2012; 2012(3):M768.

Chicago/Turabian Style

Núñez, Cristina, Javier Fernández-Lodeiro, Adrián Fernández-Lodeiro, Emília Bértolo, José Luis Capelo, and Carlos Lodeiro. 2012. "N1-(Benzo[b]thiophen-3-ylmethylidene)-N2-(2-((2-((2-(benzo[b]thiophen-3-ylmethylidene)amino)ethyl)amino)ethyl)amino)ethyl)ethane-1,2-diamine" Molbank 2012, no. 3: M768.

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