title: Synthesis and characterisation of first row transition metal complexes of functionalized 1,2,4-benzothiadiazines.
abstract: Reaction of the novel ligand 3-(2'-pyridyl)-benzo-1,2,4-thiadiazine (L) with the transition metal chloride salts MCl2·xH2O (M(II) = 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 Cu···S contacts (d(Cu···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).
authors.affiliation: Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK. erc@cantab.net.
authors.forename: Ewan R
authors.initials: ER
authors.lastname: Clark
authors.forename: Muhammad U
authors.initials: MU
authors.lastname: Anwar
authors.forename: Bryce J
authors.initials: BJ
authors.lastname: Leontowicz
authors.forename: Yassine
authors.initials: Y
authors.lastname: Beldjoudi
authors.forename: John J
authors.initials: JJ
authors.lastname: Hayward
authors.forename: Wesley T K
authors.initials: WT
authors.lastname: Chan
authors.forename: Emma L
authors.initials: EL
authors.lastname: Gavey
authors.forename: Melanie
authors.initials: M
authors.lastname: Pilkington
authors.forename: Eli
authors.initials: E
authors.lastname: Zysman-Colman
authors.forename: Jeremy M
authors.initials: JM
authors.lastname: Rawson