Synthesis, structural characterization and alcohol oxidation activity of a new mononuclear manganese(II) complex

Abstract

A manganese(II) complex of 2,4,6-tris(2-pyridyl)-1,3,5-triazine (tptz) has been synthesized and characterized by single-crystal X-ray diffraction, elemental analyses, IR, and UV-Vis spectroscopic techniques. Oxidation of alcohols to their corresponding aldehydes and ketones was conducted by this catalyst using oxone (2KHSO 5 ÁKH-SO 4 ÁK 2 SO 4 ) as an oxidant under biphasic reaction conditions (CH 2 Cl 2 /H 2 O) and tetra-n-butylammonium bromide as phase transfer agent under air at room temperature. Easy preparation, mild reaction conditions, high yields of the products, short reaction times, no further oxidation to the corresponding carboxylic acids, high selectivity and inexpensive reagents make this catalytic system a useful oxidation method for aliphatic and benzylic alcohols.Electronic supplementary material The online version of this article (

From manganese complexes to nano-sized manganese oxides as water-oxidizing catalysts for artificial photosynthetic systems: Insights from the Zanjan team

“…We reported on Mn(II), MnO 4 À and insoluble Mn products which show weak absorption bands characteristic of an {Mn 2 O 2 } core in the region of 600e700 cm À1 [13]. Using ESI(þ)eMS/MS at pH~4.5 we also showed that the mononuclear complex [Mn(tptz)(CH 3 COO)(OH 2 ) 2 ]NO 3 is not fully preserved and is in equilibrium with some cationic species [15]. In this case, a dissociative Mn-ligand process occurs in the water/ acetonitrile solution [15].…”

“…Using ESI(þ)eMS/MS at pH~4.5 we also showed that the mononuclear complex [Mn(tptz)(CH 3 COO)(OH 2 ) 2 ]NO 3 is not fully preserved and is in equilibrium with some cationic species [15]. In this case, a dissociative Mn-ligand process occurs in the water/ acetonitrile solution [15]. The experiment also showed that the most important reaction in the presence of Oxone ® is a "decoordination".…”

Dinuclear Manganese(II), Cobalt(II), and Nickel(II) Aryl Phosphates Incorporating 4′‐Chloro‐2,2′:6′,2′′‐Terpyridine Coligands – Efficient Catalysts for Alcohol Oxidation

“…Catalyst 1 demonstrated a superior catalytic activity than those all of the Mn II complexes listed in Table except for the mononuclear Mn II complex reported by Boghaei and co‐workers (Table , Entry 2). Although this mononuclear complex exhibits 100 % conversion and selectivity, the oxidant used in this case was oxone, an unfavored oxidant for organic oxidation reactions. Furthermore, it should be noted that the non‐heme Mn II complex reported by Nam and co‐workers (Table , Entry 3) and a polymeric Mn II complex reported by Bagherzadeh and co‐workers (Table , Entry 6) showed 100 % selectivity with reasonable conversion but only when harmful oxidants were employed as part of catalytic system.…”

Syntheses, structures, catalytic and antitumor activities of a series of pyrimidine derivatives coordination complexes

“…A number of methods are known for alcohol oxidations, but oxidations catalyzed by different coordination complexes such as Fe [19], Cu [20], Co [21], Mo [22], Pd [23], Mn [24], V [25] complexes in presence of H 2 O 2 as the oxidant are preferred now for their economic benefits and environmental acceptability.…”