Langmuir–Blodgett and Langmuir–Schaefer films of homoleptic and heteroleptic phthalocyanine complexes as voltammetric sensors:

Casilli, Serena; Luca, M. De; Apetrei, Constantin; Parra, Vicente; Arrieta, Andrés Adolfo Amell; Valli, Ludovico; Jiang, Jianzhuang; Rodrı́guez-Méndez, M.L.; Saja, J.A. de

doi:10.1016/j.apsusc.2004.11.002

Cited by 67 publications

(48 citation statements)

References 17 publications

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“…The limiting area calculated from the slope of the curve was 37 Å 2 . This value corresponds to an edge-on orientation with the Pc ring tilted and assembled with the main molecular axis parallel to the water subphase (lying flat they should occupy an area approximately 20 Å Â 20 Å) (Casili et al, 2005). Tyrosinase and laccase could be effectively adsorbed into the non-compressed AA/LuPc 2 films as demonstrated by the increase in the surface pressure that occurred upon injection of the enzymes underneath the air/liquid interface.…”

Section: Langmuir Monolayers and Langmuir-blodgett Filmsmentioning

confidence: 94%

Bioelectronic tongue based on lipidic nanostructured layers containing phenol oxidases and lutetium bisphthalocyanine for the analysis of grapes

Medina-Plaza

Saja

Rodrı́guez-Méndez

2014

Biosensors and Bioelectronics

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a b s t r a c tIn this work, a multisensor system formed by nanostructured voltammetric biosensors based on phenol oxidases (tyrosinase and laccase) has been developed. The enzymes have been incorporated into a biomimetic environment provided by a Langmuir-Blodgett (LB) film of arachidic acid (AA). Lutetium bisphthalocyanine (LuPc 2 ) has also been introduced in the films to act as electron mediator. The incorporation of the enzymes to the floating layers to form Tyr/AA/LuPc 2 and Lac/AA/LuPc 2 films has been confirmed by the expansion in the surface pressure isotherms and by the AFM images. The voltammetric response towards six phenolic compounds demonstrates the enhanced performance of the biosensors that resulted from a preserved activity of the tyrosinase and laccase combined with the electron transfer activity of LuPc 2 . Biosensors show improved detection limits in the range of 10. An array formed by three sensors AA/LuPc 2 , Tyr/AA/LuPc 2 and Lac/AA/LuPc 2 has been employed to discriminate phenolic antioxidants of interest in the food industry. The Principal Component Analysis scores plot has demonstrated that the multisensor system is able to discriminate phenols according to the number of phenolic groups attached to the structure. The system has also been able to discriminate grapes of different varieties according to their phenolic content. This good performance is due to the combination of four factors: the high functionality of the enzyme obtained using a biomimetic immobilization, the signal enhancement caused by the LuPc 2 mediator, the improvement in the selectivity induced by the enzymes and the complementary activity of the enzymatic sensors demonstrated in the loading plots.

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Section: Langmuir Monolayers and Langmuir-blodgett Filmsmentioning

confidence: 94%

Bioelectronic tongue based on lipidic nanostructured layers containing phenol oxidases and lutetium bisphthalocyanine for the analysis of grapes

Medina-Plaza

Saja

Rodrı́guez-Méndez

2014

Biosensors and Bioelectronics

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“…14 Jiang and coworkers developed a common theory that helps to understand the structure-property relationship for this class of molecules. [14][15][16][17] Consequently, double-decker Pc derivatives, which are being actively investigated as promising materials for sensing devices, optoelectronics and spintronics, [14][15][16][18][19][20][21][22][23][24][25][26][27][28][29] can serve as ideal model systems to study the character of interligand interactions. Recently, we reported the first examples of tetradiazepinoporphyrazine-based sandwich-type lanthanide complexes and assumed the presence of additional intramolecular interactions between the macrocycles.…”

Section: Introductionmentioning

confidence: 99%

Double-decker bis(tetradiazepinoporphyrazinato) rare earth complexes: crucial role of intramolecular hydrogen bonding

et al. 2016

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A series of homoleptic bis{tetrakis(5,7-bis(4-tert-butylphenyl)-6H-1,4-diazepino)[2,3-b,g,l,q]porphyrazinato}lanthanide sandwich complexes [(tBuPh)DzPz]2Ln (Ln = Lu, Er, Dy, Eu, Nd, Ce, La) were prepared and their physicochemical properties were studied to gain insight into the nature of specific interactions in diazepinoporphyrazines. The effect of annulated diazepine moieties and the Ln ionic radius on the properties of the complexes was investigated in comparison with double-decker phthalocyanines. A combination of experimental and theoretical studies revealed the presence of two types of hydrogen bonding interactions in the metal-free porphyrazine and the corresponding sandwich complexes, namely, interligand C-H(ax)N(meso) hydrogen bonding and O-HN(Dz) ligand-water interaction. The interligand hydrogen bonding imparts high stability of the ligand dimer and the double-decker compounds in a reduced state. This work is the first comprehensive investigation into the fundamental understanding of the unusual properties of diazepine-containing macroheterocycles.

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“…In previous works, our group has developed arrays of voltammetric sensors chemically modified with either phthalocyanines or conducting polymers [6][7][8][9][10][11]. Such arrays have been able to discriminate among model solutions of basic tastes, antioxidants and wines with clearly different organoleptic characteristics.…”

Section: Introductionmentioning

confidence: 98%

E-tongue based on a hybrid array of voltammetric sensors based on phthalocyanines, perylene derivatives and conducting polymers: Discrimination capability towards red wines elaborated with different varieties of grapes

Parra

Arrieta

Fernández-Escudero

et al. 2006

Sensors and Actuators B: Chemical

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116

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Langmuir–Blodgett and Langmuir–Schaefer films of homoleptic and heteroleptic phthalocyanine complexes as voltammetric sensors:

Cited by 67 publications

References 17 publications

Bioelectronic tongue based on lipidic nanostructured layers containing phenol oxidases and lutetium bisphthalocyanine for the analysis of grapes

Bioelectronic tongue based on lipidic nanostructured layers containing phenol oxidases and lutetium bisphthalocyanine for the analysis of grapes

Double-decker bis(tetradiazepinoporphyrazinato) rare earth complexes: crucial role of intramolecular hydrogen bonding

E-tongue based on a hybrid array of voltammetric sensors based on phthalocyanines, perylene derivatives and conducting polymers: Discrimination capability towards red wines elaborated with different varieties of grapes

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