Solvent-mediated preparation of a heterometallic [2 × 2] grid via a 1D metal–organic template with extraordinary acid/base-resistance. Issue 10 (17th January 2017)

• Record Type: Journal Article
• Authors: Han, Yi; Zheng, Hao; Li, Huijun; Wang, Hongli; Wang, Shi-Min; Geng, Yanling; Wang, Lei
• Is Part Of: RSC advances. Volume 7:Issue 10(2017)
• Page Start: 5578
• Page End: 5582
• Publication Date: 2017-01-17
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c6ra26412c
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Here, we have demonstrated that a metal–organic chain can serve as a template to prepare a heterometallic [2 × 2] grid through a solvent-mediated strategy. Abstract : A new 1D coordination polymer, [Fe II L(H2 O)]·2H2 O (1 ) (H2 L = 2, 6-bis[3-(pyrazin-2-yl)-1, 2, 4-triazoly]pyridine) with extraordinary acid/base-resistance was synthesized. It was found that the 1D metal–organic chain can serve as a template to prepare a heterometallic [2 × 2] grid [FeIII2Na2 L4 (H2 O)4 ]·8H2 O (2 ) through a solvent-mediated strategy by immersing the fresh crystals of1 in a saturated MeOH solution of NaN3 . The transformation was accompanied by the complete dissolution of the original crystals, and the cleavage/regeneration of coordination bonds. The final structure of2 was unambiguously characterized by means of a single-crystal X-ray diffraction (SCXRD) study. Notably, L 2− in1 exhibits an "acute triangle" configuration, while an "obtuse triangle" configuration is observed in2 . In addition, treatments of1 with saturated MeOH solutions of NaF, NaCl, NaBr, NaI, and NaN3 in DMF, EtOH, and H2 O were also respectively checked. The results did not show any appreciable indication, probably implying that the transformation kinetics is influenced not only by a sodium source but also by a solvent-exclusive effect. Significantly, the resulting grid of2 could not be accessed by a direct one-pot self-assembly synthetic approach.