Abstract
N,N '-Bis(pyridin-4-ylmethylene)naphthalene-1,5-diamine (L) acts as a bipyridine analogue linker ligand towards {Zn-7(mu(4)-O)(2)(OAc)(10)}, {Zn-2(NCS)(2)(OAc)(2)}, and {Zn(N-3)(2)} nodes and allows construction of three new 1-D coordination polymers, the linear chain [Zn-7(mu(4)-O)(2)(OAc)(10)(L)](n) (1), [Zn(NCS)(OAc)(L)](n) (2) in ladder-type geometry and the zigzag chain [Zn(N-3)(2)(L)](n) (3). Structural characterization reveals that in 1 acetate anionic ligands connect seven Zn(II) ions through the bridging coordination modes mu(3)-eta(1),eta(2) and mu(2)-eta(1),eta(1). The resulting heptanuclear node is located on an inversion center and therefore consists of four crystallographically distinct cations; their coordination spheres correspond to distorted octahedra or tetrahedra. The Zn(II) ions in polymer 2 exhibit distorted trigonal bipyramidal {ZnN3O2} coordination; mu(2)-eta(1),eta(1) coordinated acetate and terminal thiocyanate ligands lead to inversion-symmetric [Zn-2(NCS)(2)(OAc)(2)] secondary building units (SBU), which are further linked by the N,N '-bipyridine analogue L. Terminal coordination of two anionic azide ligands and the bridging bipyridine L result in coordination polymer 3, in which the cations adopt distorted tetrahedral {ZnN4} coordination. In all crystalline solids 1-3, adjacent 1-D chains interact through pi-pi stacking and non-classical (C - H center dot center dot center dot O, C - H center dot center dot center dot pi) hydrogen bonds, leading to 3-D supramolecular architectures. Differences in their 3-D arrangement are due to variations in the anionic co-ligands, subtle conformational differences in the semi-rigid linker and the variable coordination sphere about the zinc cations. Thermogravimetric investigations indicate differences in both thermal stability and decomposition mode. Natural bond orbital (NBO) analysis provides a convenient basis for investigating the intramolecular bonding interactions and delocalization effects in these molecular systems. Finally, solids 1-3 exhibit intense luminescence at room temperature.
Original language | English |
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Pages (from-to) | 4031-4046 |
Number of pages | 16 |
Journal | Journal of coordination chemistry |
Volume | 71 |
Issue number | 24 |
DOIs | |
Publication status | Published - 17-Dec-2018 |
Keywords
- Coordination polymers
- bipyridine analogue ligand
- natural bond orbital analysis (NBO)
- thermal analysis
- luminesence
- CRYSTAL-STRUCTURES
- X-RAY
- LIGAND
- LUMINESCENCE
- CONSTRUCTION
- TOPOLOGIES
- LONG
- DICARBOXYLATES
- COMPLEXES
- ACETATE
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CCDC 1830613: Experimental Crystal Structure Determination
Zahedi, M. (Contributor), Shaabani, B. (Contributor), Radyousefnia, N. (Contributor), Englert, U. (Contributor), Blake, G. R. (Contributor) & Aygün, M. (Contributor), University of Groningen, 18-Mar-2018
DOI: 10.5517/ccdc.csd.cc1zfx1c
Dataset
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CCDC 1825302: Experimental Crystal Structure Determination
Zahedi, M. (Contributor), Shaabani, B. (Contributor), Radyousefnia, N. (Contributor), Englert, U. (Contributor), Blake, G. R. (Contributor) & Aygün, M. (Contributor), University of Groningen, 22-Feb-2018
DOI: 10.5517/ccdc.csd.cc1z8cqb
Dataset
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CCDC 1825303: Experimental Crystal Structure Determination
Zahedi, M. (Contributor), Shaabani, B. (Contributor), Rad-Yousefnia, N. (Contributor), Englert, U. (Contributor), Blake, G. R. (Contributor) & Aygün, M. (Contributor), University of Groningen, 22-Feb-2018
DOI: 10.5517/ccdc.csd.cc1z8crc
Dataset