1. "X-shaped π-conjugated fluorophores enable cooperative ion-pair recognition with multicolour emission"

R. Tazawa, K. Watanabe, S. Mizoguchi, T. Chiba, S. Okada, R. Yamakado* Org. Biomol. Chem., accepted

2. "Construction of higher-ordered structures in alkylpyridinium-based polymers via π-conjugated anion pairing and humidity Annealing"

E. Saito, T. Yonekura, S. Okada, S. Nishitsuji, J. Matsui*, R. Yamakado* Polym. Chem. in press.

3. "Dye-Loading Mechanism in Electrochemical Self-Assembly of CuSCN/Stilbazolium Dye Hybrid Thin Films"

Y. Tsuda, T. Nakamura, A. Ueno, K. Ikeda, M. Kobayashi, H. Yamaguchi, K. Uda, R. Yamakado, S. Okada, O. Dimitriev, T. Yoshida,* J. Phys. Chem. C 2025, 129, 25, 11305–11317 (2025).

4. "Boosting the Stability of FAPbI3 Perovskite Nanocrystal Near-Infrared Light-Emitting Diodes with Aromatic Ligands and Organic Host Dispersion"

H. Abe, M. Uwano, R. Kobayashi, K. Narazaki, T. Akiyama, Y. Ito, D. Yokota, T. Oto, S. Nishitsuji, R, Yamakado, T. Chiba,* Small, 21, 31, 2501159 (2025).

5. "3-Keto-indazole derivatives exhibiting multi-coloured phosphorescence"

T. Moriyama, R. Kobayashi, T. Chiba, S. Okada, R. Yamakado,* Org. Biomol. Chem., 23, 4902– 4908 (2025) 

Front Cover

1. ”Aromatic 2,2-diphenylethylamine ligand exchange of FA0.9Cs0.1PbBr3 perovskite nanocrystals for high efficiency pure green light-emitting diodes”

S. Mizoguchi, S. Sumikoshi, H. Abe, Y. Ito, R. Yamakado, T. Chiba,* ACS Omega, 9, 32, 34692–34699 (2024) 

2. "Anion-complex formation for the wettability control of a boron-containing π-conjugated polymer"

H. Nabeta, S. Kikuchi, T. Kimura, A. Masuhara, R. Yamakado,* S. Okada, Mol. Cryst. Liq. Cryst., 768, 883–891 (2024)

3. "Preparation and Structures of Multicomponent Crystals Composed of Heteroaromatic Cations, p-Toluenesulfonate Anion, and Aromatic Hydrogen-Bond Donors"

K. Uno, R. Yamakado*, S. Okada*, A. Usman Asian J. Org. Chem., 13, e202400039 (2024)

4. "Synthesis and Optical Properties of Anion-Responsive X-shaped π-Electronic System"

K. Morii, H. Nabeta, T. Yanbe, K. Watanabe, S. Sumikoshi, T. Chiba, R. Yamakado, S. Okada, ChemistrySelect, 9, e202305008 (2024)

1. "Plasmon Enhancement of the Hot-Band Absorption Assisted Anti-Stokes Photoluminescence of Near-Infrared Dyes"

O. Dimitriev, R. Yamakado, A. Nagaoka, M. Giancaspro, F. Rizzi, N. Deparo, E. Fanizza, L. Yoshida, A. Kosar, T. Yoshida, J. Phys. Chem. C, 127, 20620-20631 (2023)

2. "Formation of charge-transfer complexes in ionic crystals composed of 1,3-bis(dicyanomethylidene)indan anion and viologens bearing alkyl chains"

E. Saito, R. Yamakado, T. Yasuhara, H. Yamaguchi, S. Okada, T. Yoshida, RSC Adv., 13, 32039 (2023)

1. "Thickness control of perovskite nanocrystals based on the molecular structure of surface ligands"

T. Kimura, R. Yamakado, N. Oshita, S. Asakura, A. Masuhara*, Appl. Phys. Express, 15, 105502 (2022)

2. "Synthesis of 3-(Phenylcarbonyl)-1H-indazole Derivatives via Intramolecular Cyclization under Mild Conditions"

S. Kuroyanagi, S. Kikuchi, S. Sumikoshi, M. Uwano, T. Chiba, R. Yamakado*, S. Okada, Asian J. Org. Chem., 11, e202200423 (2022)

3. "Synthesis of multicomponent crystals composed of 4-amino-1-methylpyridinium p-toluenesulfonate and phenol derivatives"

K. Uno, R. Yamakado*, S. Okada*, Mol. Cryst. Liq. Cryst., 742, 111-118 (2022)

4. "Gel Permeation Chromatography Process for Highly Oriented Cs3Cu2I5 Nanocrystal Film"

Y-H. Cheng, R. Suzuki, N. Shinotsuka, H. Ebe, N. Oshita, R. Yamakado, T. Chiba*, A. Masuhara, J. Kido, Sci. Rep., 12:4620 (2022)

5. "Proton conductive polymeric ionic liquids block copolymer of poly(vinylphosphonic acid)/1-propylimidazole-b-polystylene for polymer electrolyte membrane fuel cell"

Y. Suzuki, T. Nohara, K. Tabata, R. Yamakado, R. Shimada, H. Nakazaki, T. Saito, T. Makino, T. Arita, A. Masuhara, Japan. J. A. Appl. Phys., 61, SD1034 (2022)

6. "Two -Step Crystallization for Low Oxidation Tin-based Perovskite Light -Emitting Diodes"

Y-H. Cheng, R. Moriyama, H. Ebe, K. Mizuguchi, R. Yamakado, S. Nishitsuji, T. Chiba, J. Kido, ACS Appl. Mater. Interfaces, 14, 22941-22949 (2022)

7. "Reactions Introducing 4-Cyano-5-dicyanomethylene-2-oxo-3-pyrrolin-3-yl Group to 4-Ethynyl-N,N-dialkylaniline Derivatives and Characterization of the Resulting Dyes"

H. Katsuyama, R. Sumita, R. Yamakado, S. Okada, Dyes Pigm., 199, 110103 (2022)

1. “Crystal Structures and Optical Properties of Cyanine Dyes Depending on Various Counter Anions”

K. Ichijo, S. Kimura, T. Yoshida, R. Yamakado*, S. Okada*, ACS Omega 6, 28421–28431 (2021).

2. “Dianion complexes of pyrrole-based anion receptors: [2+1]-Type complexes that form ion-pairing assemblies”

R. Yamakado, H. Maeda*, J. Porphyrins Phthalocyanines 25, 1126–1132 (2021).

3. “Photoisomerization-induced patterning of ion-pairing materials based on anionic azobenzene and its complex with fluorescent π-electronic system”

R. Yamakado*, I. Kitamura, M. Hara, S. Nagano, T. Seki, H. Maeda*, Chem. Commun. 57, 4287–4290 (2021).

4. “Preparation and characterization of macrocyclic butadiyne derivatives for tubular polydiacetylenes”

S. Iyoda, G. Okada, K. Kikuchi, R. Yamakado, S. Okada*, Mol. Cryst. Liq. Cryst. 728, 10–18 (2021).

1. “Synthesis and Solid-State Polymerization of 5‑(Pyren-1-yl)penta-2,4-diyn-1-ol Derivatives with an N‑Phenylurethane or N‑Benzylurethane Group” 

S. Oshimizu, S. Takeshi, T. Sato, R. Yamakado, Y. Tatewaki, S. Okada*, Cryst. Growth Des. 20, 6356–6365 (2020). 

2. “Optical property control of π-electronic systems bearing Lewis pairs by ion coordination”

T. Yanbe, K. Mizuguchi, R. Yamakado*, S. Okada Chem. Commun. 56, 10654–10657 (2020).

3. “Ion-Pairing Assemblies of Porphyrin–AuIII Complexes in Combination with π-Electronic Receptor–Anion Complexes”

H. Tanaka, Y. Haketa, Y. Bando, R. Yamakado, N. Yasuda, H. Maeda*, Chem. Asian J. 15, 494–498 (2020).

4. “Crystal Structure Characterization of Some π-Conjugated Ionic Crystals toward Electronic Applications”

S. Kodama, S. Aoyama, Y. Tanaka, K. Ichijo, T. Yoshida, R. Yamakado*, S. Okada*, Mol. Cryst. Liq. Cryst. 704, 1–9 (2020).

5. “Switching of Two-Photon Optical Properties by Anion Binding of Pyrrole-Based Boron Diketonates through Conformation Change”

H. Kita, R. Yamakado, R. Fukuuchi, T. Konishi, K. Kamada*, Y. Haketa, H. Maeda*, Chem. Eur. J. 26, 3404–3410 (2020). 

1. “Various Ionic Crystals from the Combination of 1,3-Bis(dicyanomethylidene)indan Anion and π-Electronic Cations”

Y. Tanaka, S. Kodama, S. Aoyama, T. Yoshida, R. Yamakado*, S. Okada*, Cryst. Growth. Des. 19, 5811­–5818 (2019).

2. “Photo-responsive dimension-controlled ion-pairing assemblies based on anion complexes of π-electronic systems”

R. Yamakado, Y. Haketa, M. Hara, S. Nagano, T. Seki, H. Maeda*, Chem. Commun. 55, 10269­–10272  (2019).

3. “Substituent engineering of electrooptic chromophores to suppress their aggregation”

K. Kashiwabara, S. Inada, N. Noguchi, Y. Sato, K. Kikuchi, M. Imai, R. Yamakado, S. Okada*, Mol. Cryst. Liq. Cryst. 686, 70­–77  (2019).

4. “Switching of Dye Loading Mechanism in Electrochemical Self-Assembly of CuSCN/4-(N,N-dimethylamino) -4’-(N’-methyl)Stilbazolium Hybrid Thin Films”

Y. Tsuda, T. Nakamura, K. Uda, S. Okada, R. Yamakado, L. Sun, Y. Suzuri, P. Stadler, O. Dimitriev, T. Yoshida*, J. Electreochem. Soc. 166, B3096–B3102  (2019).

5. “Concerted Photoluminescence of Electrochemically Self-Assembled CuSCN/Stilbazolium Dye Hybrid Thin Films”

K. Uda, Y. Tsuda, S. Okada, R. Yamakado, L. Sun, Y. Suzuri, M. S. White, M. Furis, P. Stadler, O. Dimitriev, T. Yoshida, ACS Omega 4, 4056–4062  (2019).

6. “Ion-pairing assemblies based on π-extended dipyrrolylquinoxalines”

R. Yamakado, H. Ishibashi, Y. Motoyoshi, N. Yasuda, H. Maeda*, Chem. Commun. 55, 326–329  (2019). 

1. “Synthesis and Structure of Optically-Active Oligo(N-substituted-m-benzamide)s bearing Bithiophene Chromophore on the Benzene Ring”

K., Takagi*, Y., Nishikawa, K.Shimizu, K. Nobuke, R. Yamakado, S. Sugimoto, Y. Inai* Macromol. Chem. Phys. 2018, 219, 1800298. 

2. “Synthesis of Dyes with a Sulfur-Containing Heterocyclic Donor and a Pyrroline-Type Acceptor” 

Y. Rachi, R. Yamakado,* S. Okada,* Dyes and Pig. 2018, 159, 345­–351.  

3. “Complexation of Anion-Responsive π-Electronic System with Alkyl-Substituted Azobenzene Carboxylate Providing Ion-Pairing Assemblies” 

R. Yamakado, M. Hara, S. Nagano, T. Seki, H. Maeda*, Chem. Lett. 2018, 47, 404–407. 

1. “Photo-Responsive Soft Ionic Crystals: Ion-Pairing Assemblies of Azobenzene Carboxylates”  

R. Yamakado, M. Hara, S. Nagano, T. Seki, H. Maeda* Chem. Eur. J. 2017, 23, 9244–9248.  

2. “Dimension-controlled assemblies of anion-responsive π-electronic systems bearing aryl substituents with fan-shaped geometries”   

V. Lakshmi, Y. Haketa, R. Yamakado, N. Yasuda, H. Maeda* Chem. Commun. 2017, 53, 3834–3837.  

3. “Cooperatively Interlocked [2+1]-Type π-System-Anion Complexes”   

R. Yamakado, Y. Ashida, R. Sato, Y. Shigeta, N. Yasuda, H. Maeda,* Chem. Eur. J. 2017, 23, 4160–4168.