Novel dirhodium coordination polymers: the impact of side chains on cyclopropanation. Issue 20 (13th September 2018)

• Record Type: Journal Article
• Authors: Liu, Jiquan; Xu, Yeping; Groszewicz, Pedro B.; Brodrecht, Martin; Fasel, Claudia; Hofmann, Kathrin; Tan, Xijuan; Gutmann, Torsten; Buntkowsky, Gerd
• Is Part Of: Catalysis science & technology. Volume 8:Issue 20(2018)
• Page Start: 5190
• Page End: 5200
• Publication Date: 2018-09-13
• Subjects: Catalysis -- Periodicals; 541.395
• DOI: 10.1039/c8cy01493k
• Languages: English
• ISSNs: 2044-4753

Abstract

Abstract : Seven novel dirhodium coordination polymers (Rh2 –L n ) ( n = 1–7) are prepared by employing bitopic ligands to connect dirhodium nodes. Abstract : Seven novel dirhodium coordination polymers (Rh2 –L n ) ( n = 1–7) are prepared by employing bitopic ligands to connect dirhodium nodes. The formation of the framework is confirmed by attenuated total reflectance Fourier transform infrared (ATR-FTIR) and 1 H → 13 C cross polarization magic angle spinning nuclear magnetic resonance (CP MAS NMR) spectroscopy. Defect sites resulting from incomplete ligand substitution are revealed by 19 F MAS NMR. The random stacking behavior of the frameworks in the obtained solid is analyzed by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The Rh2 /O interaction in neighboring layers is investigated by diffuse reflectance ultra-violet visible light (DR-UV-vis) spectroscopy and X-ray photoelectron spectroscopy (XPS). This interaction is relevant to understand the catalytic behavior of various Rh2 –L n catalysts in the cyclopropanation of styrene with ethyl diazoacetate (EDA). In this context, the structure-reactivity relationship is discussed by taking into consideration both interlayer Rh2 /O interactions and steric effects of side chains.