Syntheses, Structures, and Photoluminescence of a Novel Class of d¹⁰ Metal Complexes Constructed from Pyridine-3,4-dicarboxylic Acid with Different Coordination Architectures

Abstract

Two novel d(10) metal coordination polymers [Zn(PDB)](n)() (1) and [Cd(3)(PDB)(2)(OH)(2)(H(2)O)(2)](n)() (2) (H(2)PDB = pyridine-3,4-dicarboxylic acid) have been synthesized under hydrothermal conditions and characterized by elemental analysis, IR, TG analysis, and single-crystal X-ray diffraction. Crystal data for 1: C(7)H(3)NO(4)Zn, orthorhombic Pna2(1), a = 8.423(17) A, b = 6.574(13) A, c = 12.899(3) A, Z = 4. Crystal data for 2: C(14)H(12)N(2)O(12)Cd(3), monoclinic C2/c, a= 20.130(4) A, b = 6.692(13) A, c = 13.081(3) A, beta = 102.78(3) degrees, Z = 4. Both compounds exhibit novel three-dimensional frameworks. Compound 1 not only possesses a one-dimensional rectangular channel but also contains infinite double-stranded helical chains. Compound 2 has two different types of channels, one being built up from pyridine rings and [CdO(5)N] and [CdO(6)] building units and the other being constructed from pyridine rings and [CdO(5)N] building units. Furthermore, both compounds show strong photoluminescence properties at room temperature.

Polymorphism in Crystalline Cinchomeronic Acid

“…Wasylina et al [28] and Harmon and Shaw [15] have reported the IR spectrum of only one polymorphic form of CA and have given partial vibrational assignments. Several metal complexes of CA have been characterised by IR [7,[29][30][31][32] and Raman [33] spectroscopies. As can be easily seen from Figures 6 and 7, the two polymorphs show significant differences in both IR and Raman spectra for either the presence of some bands only for one polymorph or the wavenumber positions of many bands or their relative intensities.…”

SYNTHESIS, STRUCTURE, THERMAL STABILITY AND FLUORESCENCE OF A NEW CADMIUM(II) COORDINATION POLYERS AS PRECURSOR FOR PREPARATION OF CdO MICRO-CRYSTAL

“…The IR spectrum of 1 shows characteristic bands of carboxyl groups at 1,585 cm -1 for the asymmetric stretching and at 1,392cm -1 for symmetric stretching. The volve of ν(ν as (-COO-)-ν s (-COO-)) indicate that the carboxylate groups coordinate to the metal atoms bridging (Δv value: 193 cm -1 ) fashion [38] . The spectrum also exhibits a strong broad band at 1610 cm -1 indicative of COO as stretching mode, while a peak corresponding to COO s vibration appeared at 1392 cm -1 [34][35][36].…”

Thermal behaviour of light lanthanide(III) complexes with 2,3-pyridinedicarboxylic acid

“…The carboxylate groups of ligands act in different modes in metal ion coordination as a bidentate bridging, bidentate chelating, threedentate chelating-bridging or monodentate so the complexes can have different structures either polymeric, dimeric and monomeric. The synthesis and physico-chemical properties of pyridine derivative ligands are important because a diversity of coordinating structures can be formed, including solid coordination polymers and their numerous applications in material chemistry, catalysis, luminescence and magnetochemistry [7][8][9][10][11][12].…”