Synthesis, Structure and Magnetic Properties of Two Cobalt(II) Dicyanamide (dca) Complexes with Heterocyclic Nitrogen Donors Tetra(2‐pyridyl)pyrazine (tppz) and 2,4,6‐Tri(2‐pyridyl)‐1,3,5‐triazine (tptz): [Co₂(tppz)(dca)₄]·CH₃CN and [Co(tptz)(dca)(H₂O)](dca)

Abstract

Two new transition metal dicyanamide complexes [Co2(tppz)(dca)4]·CH3CN (1) [tppz=tetra(2‐pyridyl)pyrazine, dca=dicyanamide] and [Co(tptz)(dca)(H2O)](dca) (2) [tptz=2,4,6‐tri(2‐pyridyl)‐1,3,5‐triazine] were synthesized and characterized by single crystal X‐ray diffraction analysis. In 1 each cobalt(II) atom is coordinated to three dca anions and one tppz molecule to form a distorted octahedral geometry, the neigbour two cobalt(II) atoms are bridged by one tppz ligand to form a dimer, then the cobalt(II) atoms in each dimer are joined together to form a ladder chain structure. In 2 the coordination geometry around the central metal is also distorted octahedral, each cobalt(II) atom is coordinated by two dca anions, one tptz molecule and one water ligand to form a cationic part, and the cationic part is linked with the free dca anions via the electrostatic attraction to give an infinite chain structure. Magnetic susceptibility measurement in the range of 2–300 K indicates that there are antiferromagnetic couplings between adjacent metal ions in 1 (T>29 K, (=−9.78 K, C=4.92 cm3·K·mol−1) and ferromagnetic couplings in 2 (T>150 K, (=7.97 K, C=2.59 cm3·K·mol−1) respectively.

Preparation, Crystal structure and Luminescence Properties of Lanthanide Complexes with 2,4,6-tri(pyridin-2-yl)-1,3,5-triazine and Organic Carboxylic Acid

“…Crystal complex 2 was prepared by 1 mmol EuCl 3 , 1 mmol TPTZ and 1 mmol HTTA, but the composition of Crystal complex 2 was [Eu(TPTZ)(CF 3 COO)(H 2 O) 5 ]·Cl 2 ·CH 3 CH 2 OH, which indicated that the ligand TTA decomposed into CF 3 COO under120 • C and 72 h. In Crystal complex 4, TPTZ coordinates with Yb ions through three nitrogen atoms of the center ring and the pyridyl ring, and the other nitrogen atoms could not coordinate with more Yb ions. However, one TPTZ may coordinate with two monovalent or bivalent transition metal ions [47][48][49]. This may be because, after coordination between TPTZ and Yb ions, trivalent Yb ions attract more electrons of TPTZ, resulting in lower electron density in other nitrogen atoms.…”

s‐Triazine pincer ligands: Synthesis of their metal complexes, coordination behavior, and applications

“…They demonstrated that the synthesized complex has weak ferromagnetic character (Scheme 24). [86] S C H E M E 1 9 Synthesis of [Mn(TPTZ)(NO 3 )(MeOH) 2 ](NO 3 ) 54, [Mn(TPTZ)(NO 3 ) cyclohexene, norbornene, and trans-stilbene to afford the corresponding epoxide with high yield, conversion, and high selectivity (up to 95%) in mild reaction conditions [87] (Scheme 25). In 2014, researchers from the Istanbul University, Turkey, [88] studied the electrochemical behavior of the [Co(TPTZ) 2 ] 2+ 68 using modified TiO 2 nanostructural electrodes via electrochemical impedance spectroscopy (EIS) and square-wave voltammetry (SWV) techniques [88] (Scheme 26).…”

“…In literature, the most common chelating fashion of this ligand is the pincer pattern shown in the left part of Figure 15 and S C H E M E 9 6 Synthesis of [Eu(tta) 3 bdpdt] as photon-sensitized luminescent material defined as mode I. [25g, 60,63,64,74,75,79,81,83,84,86,87,95,96,[206][207][208][209] In this case, TPTZ acting as a tridentate NNN-chelate coordinating the metal ion with one short M-N (s-triazine) and two longer M-N (pyridine). This fact is found in all of its pincer complexes with d-and f-block elements.…”

“…Cu-triazine/carbon nanoparticles Fuel cells Iwase et al [54] Cu-triazine/carbon nanoparticles Nitrate and carbon dioxide reduction Iwase et al [55] and Yoshioka et al [56] [Cu 2 (TPTZ)(POP) 2 ][PF 6 ] 2 OLEDs and LECs Keller et al [59] [Cu 2 (TPTZ)(xantphos) 2 ][PF 6 ] 2 OLEDs and LECs Keller et al [59] [Ag 2 (m-dppm) 2 (MeCN)(TPTZ)](SbF 6 ) 2 Luminescent properties Xu et al [70] [Ag 2 (m-dppm) 2 (TPTZ) 2 ](SbF 6 ) 2 Luminescent properties Xu et al [70] [Ag 2 (m-dppm)(TPTZ) 2 ](SbF 6 ) 2 Luminescent properties Xu et al [70] [(AgCN) 3 (2-tptz)] n Luminescent properties Lin et al [71] [Ag(tpt)(NO 3 )] n Yellow strong luminescence Yan et al [72] [Ag 8 (tpt) 4 (NO 3 ) 4 (μ 2 -CN) 2 ](NO 3 ) 2 Yellow strong luminescence Yan et al [72] [Ag 2 (TPTZ)(NO 3 ) 2 ] Oxidation of alcohols into ketones Najafpour et al [73] [Ag 5 (TPTZ) 4 ](NO 3 ) 5 Oxidation of alcohols into ketones Najafpour et al [73] [Mn(TPTZ)(OH 2 ) 3 ](CF 3 SO 3 ) 2 .EtO Oxidation of many sulfides Najafpour et al [74] {[(tptz)Mn II (H 2 O) Mn III (CN) 6 ] 2 Mn II (H 2 O) 2 } n Single chain magnet Zhang et al [79] [{Mn(0.5H 2 O)(0.5N 3 )(tptz) (NO 3 )} 2 (μ1,3-N 3 )] Magnetism Wang et al [80] [Mn II (TPTZ)(H 2 O)(NO 3 )(μ-NC) Cr III (ampy)(CN) 3 ] Magnetism Alexandru et al [82] [Mn II (TPTZ)(H 2 O)(NO 3 )(μ-NC) Cr III (phen)(CN) 3 ] Magnetism Alexandru et al [82] [Mn(TPTZ)(H 2 O)Cl(OAc)] Anticancer/antibacterial Hassoon et al [83] [Mn(TPTZ)Cl 2 (EtOH)] Anticancer/antibacterial Hassoon et al [83] [Mn(TPTZ)Cl 2 (H 2 O)] Cancer Al-Assy et al [84] [Co(TPTZ)(dca)(H 2 O)](dca) Magnetism Luo et al [86] [Co 2 (TPTZ)Cl 4 (H 2 O)] Epoxidation transformation of alkene into epoxide Maghami et al [87] Co-N multiwalled carbon nanotubes (MWCNT)…”

Synthesis, Crystal Structure, and Antimicrobial Properties of a Novel 1-D Cobalt Coordination Polymer with Dicyanamide and 2-Aminopyridine

“…The chemistry of cobalt(II) complexes with O-and Ndonor ligands has been extensively studied and it was found to have diverse properties [1,7,20,30,32]. Some of the complexes have been shown to possess antitumor properties [33], as well as antimicrobial activity against resistant microbial strains [12,34,35].…”