Bottom-up synthesis strategy of a two-dimensional {Fe₅} cluster-based coordination polymer: stepwise formation of a {Fe₅} cluster and its dimension augmentation

Abstract

Sophisticated aggregation assembly is challenging in assembly chemistry. Monitoring the assembly process helps to understand the assembly mechanism and the create new building blocks. A two-dimensional (2D) cluster-based coordination polymer...

Tracking the Stepwise Formation of a Water-Soluble Fluorescent Tb12 Cluster for Efficient Doxorubicin Detection

“…Isometric fractions were extracted from the reaction mixture at specific time intervals and diluted with the same proportion of chromatographic purity methanol for analysis. 43,44 As shown in Figure 2a,b, the changes in the molecular ion peak intensity of each component with respect to time in cationic mode appeared, indicating that the Tb 12 cluster was mainly assembled from the order of the low-core fragment to the high-core fragment (Tb ). The Tb 12 L 6 fragment showed the highest abundance at 48 h (Figure S8).…”

“…After the stability of Tb 12 cluster dissolved in solution was determined by ESI-MS, we further tracked the species variation and abundance of various reaction fragments in solution at different reaction times by ESI-MS, and the possible formation process and mechanism of the Tb 12 cluster were speculated. Isometric fractions were extracted from the reaction mixture at specific time intervals and diluted with the same proportion of chromatographic purity methanol for analysis. , As shown in Figure a,b, the changes in the molecular ion peak intensity of each component with respect to time in cationic mode appeared, indicating that the Tb 12 cluster was mainly assembled from the order of the low-core fragment to the high-core fragment (Tb 1 –Tb 12 ) by the ESI-MS data analysis. At the beginning of the reaction (0 min), the reaction solution mainly generated fragments (Tb 1 L 1 ( m / z = 502.02, [Tb 1 L 1 (O)­(NO 3 ) + 3H] + ), Tb 2 L 1 ( m / z = 756.97, [Tb 2 L 1 (HCOO) 3 (CH 3 CN)] + ), Tb 2 L 2 ( m / z = 925.07, [Tb 2 L 2 (N 3 )­(CH 3 CN)] + , m / z = 998.12, [Tb 2 L 2 (N 3 )­(CH 3 CN)­(DMF)] + )).…”

The Stepwise Formation of {Gd4} Clusters with Magnetocaloric Effect, Accompanied by In Situ Condensation Cyclization Reactions

“…For tracking the variation of various intermediates during the reaction, ESI-MS was used for characterization. − As shown in Figure a,b, analyzing the data obtained by ESI-MS test in cationic mode and the change of peak intensity of various intermediates over time, we can infer that Gd 4 clusters are mainly assembled sequentially from Gd 1 fragments to Gd 4 fragments. When the reaction starts (0 min), the main fragments L 1 ( m / z = 425.18, [L 1 (H 2 O) + H] + ), Gd 1 (L 1 ) 1 ( m / z = 600.11, [Gd 1 (L 1 ) 1 (Ac)] + ) present in the reaction solution.…”

Three-fold interpenetrated metal–organic framework as a multifunctional fluorescent probe for detecting 2,4,6-trinitrophenol, levofloxacin, and l-cystine

“…The Zn-N bond lengths range from 2.071(2) to 2.121(2) Å, and the Zn-O distances are within the range of 1.973(2) to 2.314(2) Å, respectively (Table S2 †). The Zn1 and Zn2 coordination geometries could be regarded as distorted Seesaw and octahedron, respectively, and were calculated by the SHAPE 2.1 software 45,50,51 (Table S3 †).…”