Structural diversity of the encapsulated water clusters in the 3D supramolecular assemblies: a cyclic quasi-planar hexamer of water constructed through strong hydrogen bonding interactions

Steric Effect of a Capping Ligand on the Formation of Supramolecular Coordination Networks of Ni(II): Solid-State Entrapment of Cyclic Water Dimer

“…These parameters are in the range of those found in mono- and bis(adc) bridged dinuclear and polynuclear compounds. 28 , 29 , 35 , 37 , 38 The selected bond distances and angles are listed in Tables S1 and S2 . A 14-membered ring with dimensions 7.952 Å × 3.277 Å ( Figure 2 ) is formed by two Ni(II) centers, four oxygen atoms, and eight carbon atoms (from both adc).…”

“…In the literature, different types of water clusters like cyclic, fused cyclic, branched, and chain are reported. 11 , 26 − 29 Among the small water clusters [(H 2 O) n , n = 2–10], supramolecular dimer of water is the simplest. Interestingly, three possible structures for dimer of water have been reported in the literature ( Scheme S1 ).…”

“… 28 , 35 In particular, our work indicated that a proper combination of these components was needed to yield such water clusters, one of the fascinating water clusters being the cyclic quasi-planar hexamer of water. 29 Our success with the tridendate capping ligand bpta (where bpta = N , N ′-bis(2-pyridylmethyl)- tert -butylamine) has encouraged us to go beyond the induction of reaction parameters on the products based on the demonstration of a para-substituent effect in the successful trapping of octameric water cluster in the solid state by the 26-membered unclosed pentamide cryptands. 36 Thus, we have made a chemical modification in the pyridyl moiety of the bpta ligand to make two new ligands, 6-Mebpta (2-methyl- N -((6-methylpyridin-2-yl)methyl)- N -(pyridin-2-ylmeth-yl)propan-2-amine) and 6,6′-Me 2 bpta = 2-methyl- N , N -bis((6-methylpyridin-2-yl)methyl) propan-2-amine, as shown in Figure 1 , to explore their effect on the self-assembled supramolecular networks for the Ni(II)-adc system (adc = acetylene dicarboxylate).…”

Encapsulation of a Water Octamer Chain in a Chiral 2D Sheetlike Supramolecular Coordination Network Composed of Dinickel–Dicarboxylate Subunits

“…64 Powder X-ray Studies. In each case, using a Rigaku Ultima IV diffractometer (for details, refer to the report previously communicated by this laboratory 54 ), data were collected of a fine powder, which was prepared by a mortar and a pestle and was placed on a glass sample holder, over a 2θ range of 3−50°with a scanning speed of 1°per min with 0.02°s tep.…”

Crystal structure of a seven-coordinate manganese(II) complex with tris(pyridin-2-ylmethyl)amine (TMPA)

“…A search of the Cambridge Structural Database (Version 5.39; last update May 2018; Groom et al 2016) for manganese(II) complexes containing TMPA revealed 17 structures related to the title compound. Twelve of these are dimeric in nature and contain a variety of bridging ligands (Oshio et al, 1993;Xiang et al, 1998;Shin et al, 2010;Barros et al, 2013;Khullar & Mandal, 2013), including one with bridging acetate ligands (Oshio et al, 1993). The remaining five structures are monomeric and include monodentate ligands in addition to TMPA (Oshio et al, 1993;Hitomi et al, 2005;Duboc et al, 2008;Shin et al, 2010;Ogo et al, 2014).…”