Dicarboxylate Modulating Molecular–Ionic Platinum Compounds with Variable Stacking and Photoluminescence

• Published in: Inorganic chemistry Vol. 61; no. 4; pp. 1997 - 2009
• Main Authors: Zhang, Ruo-Yi, Cui, Ming-Hui, Wang, Wei-Wei, Li, Wen-Liang, Zhao, Jiong-Peng, Liu, Fu-Chen
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 31.01.2022
• ISSN: 0020-1669; 1520-510X
• DOI: 10.1021/acs.inorgchem.1c03146

Under solvothermal conditions, 10 molecular–ionic platinum compounds [Pt­(NIA)2]·(L)·nH2O (L = dicarboxylate) were synthesized. In the reaction, acetonitrile undergoes trimerization in situ to generate N-(1-iminoethyl)­acetamidine (NIA), which coordinates to PtII ions in forming the N-(1-iminoethyl)­acetamidine platinum cation, while the organic carboxylates act as anions. Structural analysis shows that carboxylate ligands regulate the mode of packing of [Pt­(NIA)2] in those compounds. Photoluminescence studies show that the photoluminescence behaviors of those compounds also depended on the carboxylate ligands. 1–4, 6, and 7 show blue light emission with fluorescence emission wavelengths of 437–440 nm despite the different carboxylate ligands used. 5 and 8 show green emissions with maximum intensity peak positions of 522 nm. Compared with that of 5 and 8, the emission of 9 and 10 has the same red shifts with peak positions of 567 and 528 nm. The variable-temperature photoluminescence studies reveal that 8 and 10 show two different thermal quenching (TQ) zones in the range of 80–420 K, while the emission intensity of 9 shows negative thermal quenching at low temperatures of 80–220 K and TQ in the range of 220–420 K.