Structures and Fluorescent and Magnetic Behaviors of Newly Synthesized NiII and CuII Coordination Compounds

Abstract

Newly designed three trinuclear coordination compounds [Ni 3 (L 1) 2 (OAc) 2 (CH 3 OH) 2 ] (1), [Ni 3 (L 1) 2 (OAc) 2 (CH 3 CH 2 CH 2 OH) 2 ]•2CH 3 CH 2 CH 2 OH (2) and [Ni 3 (L 1) 2 (OAc) 2 (DMF) 2 ]•1.71DMF (3) and one mononuclear coordination compound [Cu(L 2) 2 ] (4) have been synthesized by H 2 L 1 and nickel(II) and copper(II) acetate hydrates in different solvents. Single-crystal X-ray structure determinations revealed that the coordination compounds 1-3 have analogous molecular structures. The coordination compounds 1, 2, and 3 were affected by the coordinated methanol, n-propanol, and N,N-dimethylformamide molecules, respectively, and the various coordinated solvent molecules give rise to the formation of the representive solvent-induced Ni II coordination compounds. All the Ni II atoms are six-coordinated with geometries of slightly distorted octahedron. Obviously, in the coordination compound 4, the expected salamo-like mono-or tri-nuclear Cu II coordination compound has not been obtained, but a new Cu II coordination compound [Cu(L 2) 2 ] has been gained. The Cu1 atom is four-coordinated and possesses a geometry of slightly distorted planar quadrilateral. Furthermore, the fluorescence properties of coordination compounds 1-4 and magnetic behavior of coordination compound 1 were investigated.

Syntheses, structural characterizations, and electrochemical and fluorescent properties of homo‐ and hetero‐polynuclear transition metal(II) complexes

“…The Cu1─O5 and Cu1─O6 bond distances are 1.9078(10) and 1.9181(10) Å, respectively, indicating that the bridging Cu─O bonds are slightly asymmetric. The Cu1─Cu2 bond distance is 2.994(3) Å, which is similar to that of previous reports, and shows weak interactions between them . The Cu1–O5–Cu2 and O5–Cu1–O6 angles are 102.38(1)° and 77.32(1)°, respectively.…”

“…Cyclic voltammetry of complex 1 was performed at 300 K under a nitrogen atmosphere using DMF solutions. There is no solvent molecule involved in complex 1 , so DMF does not displace the solvent molecule causing the complex to dissociate, and complex 1 is stable in DMF . The electrochemical measurement was conducted using a standard three‐electrode cell, with a glassy carbon disc ( U = 5 mm) as working electrode, a platinum wire as auxiliary electrode and Ag/AgNO 3 as reference at a scanning rate of 50 mV s −1 .…”

Unprecedented Dinuclear CuII N,O-Donor Complex: Synthesis, Structural Characterization, Fluorescence Property, and Hirshfeld Analysis

“…This phenomenon of oxime oxygen atom participating in coordination has not been previously reported in the literature [6,9,11−13] and may be due to the catalysis of the Cu II ion upon coordination [16]. Compared with the previously reported M/L as 1:2 [68], 3:2 [69], and 2:2 [70] complexes, it consisted of two Cu II ions and two wholly deprotonated (L 2 ) 2-units. The two Cu II ions (Cu1 and Cu2) have different (N2O3 and N2O2) coordination environments.…”

Three Polyhydroxyl-Bridged Defective Dicubane Tetranuclear MnIII Complexes: Synthesis, Crystal Structures, and Spectroscopic Properties

“…The most important FT-IR bands are listed in Table 2. In the Mn III complexes 1, 2, and 3, the bands appear at about 3437, 3416, and 3445 cm −1 , respectively, are attribute to O-H stretching frequency coordination methanol or water molecules, which confirmed by the crystal structure [64][65][66][67][68][69]. No characteristic C=N stretching band is found in complexes 1, 2, and 3 indicating that the ligands HL 1 , HL 2 , and HL 3 are converted into the polyhydroxy deprotonation ligands and coordinated to the Mn III ions.…”