A Novel Twofold Interpenetrating 2D (3,5)-Connected Cd(II) Coordination Framework with (52.6)(55.64.7) Topology

Abstract

The self-assembly of 4 0 -(4-carboxyphenyl)-4,2 0 :6 0 4 00 -terpyridine (HL) with Cd(II) cation afforded one novel twofold interpenetrating 2D coordination polymer, [Cd(L) 2 (H 2 O) 1.5 ] n . In this compound, the Cd(II) atoms as 5-connected nodes are linked by the bridging ligands L acting as both linear connectors and 3-connected nodes to form a novel (3, 5)-connected 2D framework with the (5 2 .6)(5 5 .6 4 .7) topology. Two equivalents of such 2D framework interpenetrate with each other to form a more complicated supramolecular network. Furthermore, fluorescent measurement on the powder sample shows that the complex strongly emits at 399 nm with the excitation of 331 nm.

2D → 2D Parallel interpenetration of (4,4) sheets constructed from a ditopic bis(4,2′:6′,4′′-terpyridine)

“…2 To date, no examples are known in which the central pyridine ring is coordinated and the remaining divergent donor set lends itself to the assembly of 1-dimensional coordination polymers or metallomacrocycles. 1 The incorporation of diphenylphosphino, 3 carboxylato, [4][5][6][7][8][9][10][11][12][13] or pyridyl [13][14][15][16][17][18][19][20] functionalities into the scaffold leads to the assembly of molecular capsules and networks. Multitopic ligands incorporating multiple 2,2′:6′,2′′-terpyridine domains 21 have significantly expanded the diversity of structures accessible with the chelating 2,2′:6′,2′′-tpy unit and have led to a wide range of architectures.…”

Divergent 4,2′:6′,4′′- and 3,2′:6′,3′′-terpyridines as linkers in 2- and 3-dimensional architectures

“…20 The same connectivity pattern is observed in ij{CdIJ4′-IJ4-cp)-4,2′:6′,4″-tpy) 2 }•1.5H 2 O] n , but in this case, the nets interpenetrate. 21 3a), whereas ij{Cd 2 IJ4′-IJ4-cp)-4,2′:6′,4″-tpy) 4 }•3.5H 2 O] n exhibits doubly interpenetrating (4,4) nets. 22 One structure deserves particular attention.…”