H. F. Higginbotham, R. P. Cox, S. Sandanayake, B. A. Graystone, S. J. Langford et al., A fluorescent "2 in 1" proton sensor and polarity probe based on coresubstituted naphthalene diimide, Chem. Commun, vol.49, pp.5061-5063, 2013.

G. Signore, R. Nifosì, L. Albertazzi, R. Bizzarri, and A. Ranieri, Novel Coumarin Fluorescent Sensor to Probe Polarity Around Biomolecules, J. Biomed. Nanotechnology, vol.5, p.722, 2009.

H. Sunahara, Y. Urano, H. Kojima, and T. Nagano, Design and Synthesis of a Library of BODIPY-Based Environmental Polarity Sensors Utilizing Photoinduced Electron-Transfer-Controlled Fluorescence ON/OFF Switching, J. Am. Chem. Soc, vol.129, pp.5597-5604, 2007.

A. K. Mora, S. Murudkar, A. Alamelu, S. Chattopadhyay, and S. Nath, Role of solvent Hbonding and polarity on photophysical properties of a benzothiazole-based ratiometric amyloid fibril sensor, J. Photochem. and Photobiol. A: Chem, vol.373, pp.20-27, 2019.

S. F. Zhou, J. Shao, Y. Yang, J. Zhao, H. Guo et al., Molecular Rotors as Fluorescent Viscosity Sensors: Molecular Design, Polarity Sensitivity, Dipole Moments Changes, Screening Solvents, and Deactivation Channel of the Excited States, Eur. J. Org. Chem, pp.4773-4787, 2011.

S. C. Lee, J. Heo, H. C. Woo, J. Lee, Y. H. Seo et al., Fluorescent Molecular Rotors for Viscosity Sensors, Chem. Eur. J, vol.24, pp.13706-13718, 2018.

S. C. Lee, J. Heo, J. Ryu, C. Lee, and S. Kim,

. Kwon, Pyrrolic molecular rotors acting as viscosity sensors with high fluorescence contrast, Chem. Commun, vol.52, pp.13695-13698, 2016.

S. Raut, J. Kimball, R. Fudala, H. Doan, B. Maliwal et al.,

V. Dzyubad and Z. Gryczynski, A homodimeric BODIPY rotor as a fluorescent viscosity sensor for membrane-mimicking and cellular environments, Phys. Chem. Chem. Phys, vol.16, pp.27037-27042, 2014.

J. Qiu, S. Jiang, H. Guo, and F. Yang, An AIE and FRET-based BODIPY sensor with large Stoke shift: Novel pH probe exhibiting application in CO3 2? detection and living cell imaging, Dyes Pigm, vol.157, pp.351-358, 2018.

L. Chen, L. He, F. Ma, W. Liu, Y. Wang et al.,

S. Chai and . Wang, Covalent Organic Framework Functionalized with 8-Hydroxyquinoline as a Dual-Mode Fluorescent and Colorimetric pH Sensor, ACS Appl. Mater. Interfaces, vol.10, pp.15364-15368, 2018.

M. Martineau, A. Somasundaram, J. B. Grimm, T. D. Gruber, D. Choquet et al.,

D. Lavis and D. Perrais, Semisynthetic fluorescent pH sensors for imaging exocytosis and endocytosis, Nat. Commun, vol.8, p.1412, 2017.

R. Gotor, P. Ashokkumar, M. Hecht, K. Keil, and K. Rurack, Optical pH Sensor Covering the Range from pH 0-14 Compatible with Mobile-Device Readout and Based on a Set of Rationally Designed Indicator, Dyes, Anal. Chem, vol.89, pp.8437-8444, 2017.

M. Matsui, T. Yamamoto, K. Kakitani, S. Biradar, Y. Kubota et al., UV-vis absorption and fluorescence spectra, solvatochromism, and application to pH sensors of novel xanthene dyes having thienyl and thieno[3,2-b]thienyl rings as auxochrome, Dyes Pigm, vol.139, pp.533-540, 2017.

Z. Li, L. J. Li, T. Sun, L. Liu, and Z. Xie, Benzimidazole-BODIPY as optical and fluorometric pH sensor, Dyes Pigm, vol.128, pp.165-169, 2016.

S. Achelle, J. Rodríguez-lo?pez, F. Bures?, and F. Robin-le-guen, Dipicolylamine Styryldiazine Derivatives: Synthesis and Photophysical Studies, vol.121, pp.305-311, 2015.
URL : https://hal.archives-ouvertes.fr/hal-01166771

C. Hadad, S. Achelle, I. Lo?pez-solera, J. C. García-martínez, and J. Rodríguez-lo?pez, Metal Cation Complexation Studies of 4-Arylvinyl-2,6-di(pyridin-2-yl)pyrimidines: Effect on the Optical Properties, Dyes Pigm, vol.97, pp.230-237, 2013.
URL : https://hal.archives-ouvertes.fr/hal-00878601

M. Z. Wu, J. Y. Shi, P. Y. Chen, and L. Tian, A three-dimensional Cd(II) metal-organic framework: a bifunctional luminescence sensor for benzaldehyde and Fe 2+ ions, New J. Chem, vol.43, pp.10575-10582, 2019.

Z. Zhan, X. Liang, X. Zhang, Y. Jia, and M. Hu, A water-stable europium-MOF as a multifunctional luminescent sensor for some trivalent metal ions (Fe 3+ , Cr 3+ , Al 3+ ), PO4 3? ions, and nitroaromatic explosives, Dalton Trans, vol.48, pp.1786-1794, 2019.

Z. Guo, T. Hu, X. Wang, T. Sun, T. Li et al., Highly sensitive and selective fluorescent sensor for visual detection of Cu2+ in water and food samples based on oligothiophene derivative, J. Photochem. Photobiol. A, vol.371, pp.50-58, 2019.

M. Denis, J. Pancholi, K. Jobe, M. Watkinson, and S. M. Goldup, Chelating Rotaxane Ligands as Fluorescent Sensors for Metal Ions, Angew. Chem. Int. Ed, vol.57, pp.5310-5314, 2018.

L. Yang, C. Lian, X. Li, Y. Han, L. Yang et al., Highly Selective Bifunctional Luminescent Sensor toward Nitrobenzene and Cu 2+ Ion Based on Microporous Metal-Organic Frameworks: Synthesis, Structures, and Properties, ACS Appl. Mater. Interfaces, vol.9, pp.17208-17217, 2017.

W. Yan, C. Zhang, S. Chen, L. Han, and H. Zheng, Two Lanthanide Metal-Organic Frameworks as Remarkably Selective and Sensitive Bifunctional Luminescence Sensor for Metal Ions and Small Organic Molecules, ACS Appl. Mater. Interfaces, vol.9, pp.1629-1634, 2017.

S. Achelle, J. Rodríguez-lópez, F. Bures?, and F. Robin-le-guen, Tuning the photophysical properties of push-pull azaheterocyclic chromophores by protonation: a brief overview of a French-Spanish-Czech Project, Chem. Rec
URL : https://hal.archives-ouvertes.fr/hal-02364874

S. W. Kim, T. Um, S. Shin, and S. , Brønsted acid-catalyzed ?-halogenation of ynamides from halogenated solvents and pyridine-N-oxides, Chem. Commun, vol.53, pp.2733-2736, 2017.

M. Broquier, S. Soorkia, C. Dedonder-lardeux, C. Jouvet, P. Theulé et al., Twisted Intramolecular Charge Transfer in Protonated Amino Pyridine, J. Phys. Chem. A, vol.120, pp.3797-3809, 2016.
URL : https://hal.archives-ouvertes.fr/hal-01346468

J. Xiong, K. Wang, Z. Yao, B. Zou, J. Xu et al., Multi-Stimuli-Responsive Fluorescence Switching from a Pyridine-Functionalized Tetraphenylethene AIEgen, ACS Appl. Mater. Interfaces, vol.10, pp.5819-5827, 2018.

Y. Wei, Q. Li, W. Li, J. Cheng, and S. A. Mcdowell, Influence of the protonation of pyridine nitrogen on pnicogen bonding: competition and cooperativity, Phys. Chem. Chem. Phys, vol.18, pp.11348-11356, 2016.

E. Cariati, C. Botta, S. G. Danelli, A. Forni, A. Giaretta et al., Solid state and solution fine tuning of the linear and nonlinear optical properties of (2-pyrene-1-yl-vinyl)pyridine by protonation-deprotonation reactions, Chem. Commun, vol.50, pp.14225-14228, 2014.

M. Li, Y. Yuan, and Y. Chen, Acid-Induced Multicolor Fluorescence of Pyridazine Derivative, ACS Appl. Mater. Interfaces, vol.10, pp.1237-1243, 2018.

J. Do, Y. Kim, A. J. Attias, D. Kreher, and E. Kim, Patterning of pH Sensitive Fluorescent Bipyridazine Derivatives, J. Nanosc. Nanotech, vol.10, pp.6874-6878, 2010.

E. V. Verbitskiy, E. M. Dinastiya, A. A. Baranova, K. O. Khokhlov, R. D. Chuvashov et al., Dyes Pigm, vol.159, pp.35-44, 2018.

S. Kato, Y. Yamada, H. Hiyoshi, K. Umezu, and Y. Nakamura, Series of carbazole-pyrimidine conjugates: syntheses and electronic, photophysical, and electrochemical properties, J. Org. Chem, vol.80, pp.9076-9090, 2015.

H. Muraoka, T. Obara, and S. Ogawa, Systematic synthesis, comparative studies of the optical properties, and the ICT-based sensor properties of a series of 2,4,6-tri(5-aryl-2-thienyl)pyrimidines with the D-?-A system, Tetrahedron Lett, vol.57, pp.3011-3015, 2016.

R. W. Sinkeldam, P. Marcus, D. Uchenik, and Y. Tor, Multisensing Emissive Pyrimidine, ChemPhysChem, vol.12, pp.2260-2265, 2011.

L. Xu, H. Zhu, G. Long, J. Zhao, D. Li et al., 4-Diphenylamino-phenyl substituted pyrazine: nonlinear optical switching by protonation, J. Mater. Chem. C, vol.3, pp.9191-9196, 2015.

H. Muraoka, N. Iwabuchi, and A. Ogawa, A series of 2,5-bis(5-aryl-2-thienyl)pyrazines with a linearshaped (D-pi)(2)-A system: synthesis and study of the optical properties including fluorosolvatochromism and proton-base-sensing, Bull. Chem. Soc. Jpn, vol.92, pp.1358-1369, 2019.

V. Schmitt, S. Moschel, and H. Detert, Diaryldistyrylpyrazines: Solvatochromic and Acidochromic Fluorophores, Eur. J. Org. Chem, pp.5655-5669, 2013.

C. W. Lee, J. K. Kim, S. H. Joo, and J. Y. Lee, High Quantum Efficiency Blue Phosphorescent Organic Light-Emitting Diodes Using 6-Position-Modified Benzofuro

. Derivatives, ACS Appl. Mater. Interfaces, vol.56, pp.2169-2173, 2013.

W. Li, J. Li, D. Liu, V. Li, and D. Zhang, Dual n-type units including pyridine and diphenylphosphine oxide: effective design strategy of host materials for high-performance organic light-emitting diodes, Chem. Sci, vol.7, pp.6706-6714, 2016.

J. Lee, S. Lee, J. H. Kim, S. O. Kang, and W. S. Han, Triaryl boron derivatives of pyridine as electron transporting materials for blue phosphorescent organic light-emitting diodes, Org. Electron, vol.62, pp.5-11, 2018.

Y. Hu, M. Kye, J. Y. Young, Y. B. Lim, and J. Yoon, Design for a small molecule based chemosensor containing boron and pyridine moieties to detect HF, Sens. Actuators B: Chem, vol.255, pp.2621-2627, 2018.

S. Xu, Y. Zhu, R. Li, J. Su, S. Li et al., Thiophene-based pyridine derivatives: synthesis, crystal structures, two-photon absorption properties and bio-imaging applications in the near-IR region, New J. Chem, vol.40, pp.8809-8814, 2016.

C. K. Namboodiri, S. R. Bongu, P. B. Bisht, R. Mukkamala, B. Chandra et al.,

J. T. Kelly and . Costello, Enhanced two photon absorption cross section and optical nonlinearity of a quasi-octupolar molecule, Journal of Photochemistry and Photobiology A: Chemistry, vol.314, pp.60-65, 2016.

S. Achelle, N. Plé, and A. Turck, Incorporation of pyridazine rings in the structure of functionalized ?-conjugated materials, RSC Adv, vol.1, pp.364-388, 2018.
URL : https://hal.archives-ouvertes.fr/hal-00875514

S. Achelle and N. Plé, Pyrimidine ring as building block for the synthesis of functionalized ?-conjugated materials, Curr. Org. Synth, vol.9, pp.163-187, 2012.
URL : https://hal.archives-ouvertes.fr/hal-00862261

S. Achelle, C. Baudequin, and N. Plé, Luminescent materials incorporating pyrazine or quinoxaline moieties, Dyes Pigm, vol.98, pp.575-600, 2013.
URL : https://hal.archives-ouvertes.fr/hal-00879623

R. Komatsu, H. Sasabe, and J. Kido, Recent progress of pyrimidine derivatives for high-performance organic light-emitting devices, J. Photonics Energy, vol.8, p.32108, 2018.

G. N. Lipunova, E. V. Nosova, V. N. Charushin, and O. N. Chupakhin, Functionalized quinazolines and pyrimidines for optielectronic materials, Curr. Org. Synth, vol.15, pp.793-814, 2018.

E. V. Nosova, S. Achelle, G. N. Lipunova, V. N. Charuchin, and O. N. Chupakhin, Functionalized benzazines as luminescent materials and components for optoelectronics

D. Liu, Z. Zhang, H. Zhang, and Y. Wang, A novel approach towards white photoluminescence and electroluminescence by controlled protonation of a blue fluorophore, Chem. Commun, vol.49, pp.10001-10003, 2013.

C. Romero-nieto, S. Durben, I. M. Kormos, and T. Baumgartner, Simple and Efficient Generation of White Light Emission From Organophosphorus Building Blocks, Adv. Funct. Mater, vol.19, pp.3625-3631, 2009.

M. Li, Y. Yuan, and Y. Chen, Acid-induced Multicolor Fluorescence of Pyridazine Derivative, ACS Appl. Mater. Interfaces, vol.101, pp.1237-1243, 2018.

J. Tydlitát, S. Achelle, J. Rodríguez-lópez, O. Pytela, T. Mikýsek et al., Photophysical properties of acid-responsive triphenylamine derivatives bearing pyridine fragments: Towards white light emission, Dyes Pigm, vol.146, pp.467-478, 2017.

S. Achelle, J. Rodríguez-lópez, N. Cabon, and F. Robin-le-guen, Protonable pyrimidine derivative for white light emission, RSC Adv, vol.5, pp.107396-107399, 2015.
URL : https://hal.archives-ouvertes.fr/hal-01254812

S. Achelle, J. Rodríguez-lópez, C. Katan, and F. Robin-le-guen, Luminescence Behavior of Protonated Methoxy-Substituted Diazine Derivatives: Toward White Light Emission, J. Phys. Chem. C, vol.120, pp.26986-26995, 2016.

S. Achelle, J. Rodríguez-lópez, M. Larbani, R. Plaza-pedroche, and F. Robin-le-guen, Carbazoleand triphenylamine-substituted pyrimidines: synthesis and photophysical properties, vol.24, p.1742, 2019.

Z. Wang, Q. Cao, S. Lin, L. Zhuo, and Z. , Li 2,6-Diphenylpyridine-based fluorophores:Synthesis, photophysical properties and effects of protonation, J. of Photochem. Photobiol. A: Chemistry, pp.106-112, 2013.

A. Michaleviciute, E. Gurskyte, D. Y. Volyniuk, V. V. Cherpak, G. Sini et al.,

. Grazulevicius, Star-Shaped Carbazole Derivatives for Bilayer White Organic Light-Emitting Diodes Combining Emission from Both Excitons and Exciplexes, J. Phys. Chem. C, vol.116, pp.20769-20778, 2012.

S. Mukherjee and P. Thilagar, Organic White-Light Emitting Materials, Dyes Pigm, vol.110, pp.2-27, 2014.

B. W. D'andrade, R. J. Holmes, and S. R. Forrest, Efficient Organic Electrophosphorescent White-Light-Emitting Device with a Triple Doped Emissive Layer, Adv. Mater, vol.16, pp.624-628, 2004.

Y. Sun, N. C. Giebink, H. Kanno, B. Ma, M. E. Thompson et al., Management of Singlet and Triplet Excitons for Efficient White Organic Light-Emitting Devices, Nature, vol.440, pp.908-912, 2006.

F. Kournoutas, K. Seintis, N. Karakostas, J. Tydlitát, S. Achelle et al., Photophysical and Protonation Time Resolved Studies of DonorAcceptor Branched Systems With Pyridine Acceptors, J. Phys. Chem. A, vol.123, pp.417-428, 2019.
URL : https://hal.archives-ouvertes.fr/hal-01952327

S. Achelle, I. Nouira, B. Pfaffinger, Y. Ramonden, N. Plé et al., Bis(arylvinyl)pyrimidine Oligomers: Synthesis and Optical Properties, J. Org. Chem, vol.4, pp.3711-3717, 2009.
URL : https://hal.archives-ouvertes.fr/hal-02385080

M. Fecková, P. Poul, F. Robin-le-guen, T. Roisnel, O. Pytela et al.,

. Achelle, 4-distyryl and 2,4,6-tristyrylpyrimidines: synthesis and photophysical properties, J. Org. Chem, vol.2, pp.11712-11726, 2018.
URL : https://hal.archives-ouvertes.fr/hal-01880133

A. Koutsoubelitis, K. Seintis, D. Tsikritzis, J. Oriou, C. Brochon et al., Photophysics, Electronic Structure and Solar Cell Performance of a Donor-Acceptor Poly(N-dodecyl-2,7-carbazolealt-benzothiadiazole), vol.59, pp.202-212, 2018.
URL : https://hal.archives-ouvertes.fr/hal-01783553

N. Karakostas, E. Martinou, A. Kaloudi-chantzea, K. Seintis, H. Oberacher et al., Energy Transfer within Self-Assembled Cyclic

, Multichromophoric Arrays Based on Orthogonally Arranged Donor -Acceptor Building Blocks, Faraday Disc, vol.185, pp.433-454, 2015.

N. Droseros, K. Seintis, M. Fakis, S. Gardelis, and A. Nassiopoulou, Steady State and Time Resolved Photoluminescence Properties of CuInS2/ZnS Quantum Dots in Solutions and in Solid Films, J. Lumin, vol.167, pp.333-338, 2015.

J. R. Lacowicz, Principles of Fluorescence Spectroscopy, 2006.

J. B. Birks, Photophysics of Aromatic Molecules, 1970.

T. Annable, I. Soutar, and G. , Rumbles, a,a-Dinaphthylpropane: a model for polymer photophysics and a probe for the investigation of macromolecular dynamics?, Polymer, vol.34, pp.3576-3581, 1993.