Synthesis and characterisation of first row transition metal complexes of functionalized 1,2,4-benzothiadiazines
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Reaction of the novel ligand 3-(2′-pyridyl)-benzo-1,2,4-thiadiazine (L) with the transition metal chloride salts MCl2·xH2O (MII = Mn, Fe, Co, Cu and Zn) in a 2 : 1 mole ratio afforded the mononuclear octahedral (high spin) complexes L2MCl2 (1a–1e respectively) in which L binds in a chelate fashion via N(2) and the pyridyl N atoms. In the case of CuCl2 the intermediate 1 : 1 four-coordinate complex LCuCl2 (2) was also isolated which adopts a polymeric structure with pseudo-square planar molecules linked via long CuS contacts (dCu…S = 2.938(1) Å) in the apical position. In the presence of non-interacting ions, 3 : 1 complexes are isolated, exemplified by the reaction of L with Fe(CF3SO3)2 in a 3 : 1 ratio which affords the low spin complex [L3Fe][CF3SO3]2 (3). Reaction of L with VCl3 in a 2 : 1 mole ratio under aerobic conditions afforded the vanadyl complex [L2V(=O)Cl][Cl] (4).
Clark , E R , Anwar , M U , Leontowicz , B J , Beldjoudi , Y , Hayward , J J , Chan , W T K , Gavey , E L , Pilkington , M , Zysman-Colman , E & Rawson , J M 2014 , ' Synthesis and characterisation of first row transition metal complexes of functionalized 1,2,4-benzothiadiazines ' Dalton Transactions , vol 43 , no. 34 , pp. 12996-13005 . DOI: 10.1039/c4dt01413h
© Royal Society of Chemistry 2014. This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at http://dx.doi.org/10.1039/C4DT01413H
The authors thank the EPSRC (E.R.C.), NSERC (M.P.; J.M.R.; E.Z.-C.) and the Canada Research Chairs program (M.P.; J.M.R.) for financial support
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