Effect of substituent groups on the structures of two semi-flexible bis(imidazole) directed Zn(II)-5-sulfoisophthalate coordination polymers: Syntheses, structures and photoluminescent properties
Polyhedron, cilt.139, ss.73-79, 2018 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 139
- Basım Tarihi: 2018
- Doi Numarası: 10.1016/j.poly.2017.09.049
- Dergi Adı: Polyhedron
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Sayfa Sayıları: ss.73-79
- Anahtar Kelimeler: 5-Sulfoisophthalate, Coordination polymers., Bis(imidazole) complexes, Photoluminescence, Protonated ligands
- Kırklareli Üniversitesi Adresli: Evet
Özet
Two new metal organic architectures, formulated as {(pbetixH2)0.5[Zn(µ-sip)(µ-pbetix)0.5]}n (1) and {[Zn2(µ-sip)2(pbisopix)(pbisopixH)2]·4H2O}n (2), were synthesized based on the rarely employed 1,4-bis((2-ethylimidazol-1-yl)methyl)benzene (pbetix) and 1,4-bis((2-isopropylimidazol-1-yl)methyl)benzene (pbisopix) ligands, along with the 5-sulfoisophthalate (sip) ligand. Complexes 1 and 2 were synthesized in basic medium and under mild hydrothermal conditions. Both complexes were characterized by elemental analysis, FT-IR spectroscopy and single crystal X-ray diffraction studies. Crystallographic studies of complexes 1 and 2 reveal that the Zn(II) ions are µ-bridged by trianionic sip3− ligands in the bis(monodentate) coordination mode to generate 1D polymer chains. In the complexes, adjacent chains are linked by the bis(imidazole) ligands to form a 2D structure. Complex 1 is the first example containing a protonated bis(imidazole) ligand, namely the pbetixH2 cation, while complex 2 is the first example with a monoprotonated bis(imidazole) ligand, namely pbisopixH. Topological analyses of the 2D coordination polymers reveal that complex 1 is a 3-fold polycatenated 4-connected uninodal net with the point symbol of {44.62}, whereas complex 2 is a 3-connected uninodal net with the point symbol of 63. The thermal behavior, photoluminescent properties and topological analysis of the complexes are also discussed herein.