Hydrothermal syntheses, structures and luminescent properties of Zn(ii) coordination polymers assembled with benzene-1,2,3-tricarboxylic acid involving in situ ligand reactions

A two-dimensional ZnIIcoordination polymer constructed from benzene-1,2,3-tricarboxylic acid andN,N′-bis[(pyridin-4-yl)methylidene]hydrazine

“…The emissions of this compound are probably due to ! * transitions of ligands because similar peaks also appear for free H 3 tbc (Liu et al, 2011) and bpymh (Sanda et al, 2013).…”

“…The Zn-O bond lengths range from 1.956 (2) to 2.279 (2) Å and the Zn-N bond length is 2.060 (2) Å (Table 2); these values are comparable with the bond lengths reported in another Zn II coordination polymer, i.e. {[Zn 3 (1,2,3-btc) 2 (bbi) 3 ] 2 Á3H 2 O} n [bbi is 1,1 0 -(butane-1,4-diyl)bis(imidazole); Zn-O = 1.980 (3)-2.233 (4) Å and Zn-N = 2.011 (4) and 2.041 (4) Å ; Liu et al, 2011]. The Zn2 centre adopts a slightly distorted octahedral geometry completed by one bpymh N atom, two carboxylate O atoms from two different tbc 3À ligands, two hydroxide O and one water O atom.…”

Poly[(μ5-3-carboxybenzene-1,2-dicarboxylato)lead(II)]: a helical lead(II) coordination polymer

“…6). Free benzene-1,2,3-tricarboxylic acid displays a fluorescent emission band at 440 nm ( ex = 330 nm; Liu et al, 2011). The observed red shift of the emission of (I) from that of 1,2,3-H 3 btc may be assigned to ligand-to-metal charge transfer between delocalized -bonds of the 1,2,3-Hbtc 2À carboxyl groups and the p orbitals of the Pb II centres (Blasse & Grabmaier, 1994).…”

An unprecedented seven-connected coordination network based on octanuclear supertetrahedral lead(II) cluster as a secondary building unit

“…4, complex 1 shows a strong emission peak at 495 nm with excitation at 328 nm. The free benzene-1,2,3-tricarboxylic acid ligand displays a fluorescent emission band at 440 nm (λ ex = 330 nm) based on the literature [33]. The observed largely red-shift of complex 1 from the 1,2,3-H 3 btc ligand emission may be assigned to the ligand-to-metal charge-transfer (LMCT) between delocalized π bonds of the 1,2,3-btc carboxylate groups and p orbitals of the Pb(II) centers [20,34].…”