Synthesis and Structural Systematics of First-Row Transition Metal Complexes with 2-[Bis(benzimidazol-2-ylmethyl)amino]ethanol

Kazuhiro Takahashi, Yuzo Nishida

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

A nickel(II) complex with (bbimae) (= 2-[bis(benzimidazol-2-ylmethyl)amino]ethanol), [Ni(bbimae)(NCS)2] • H20 (1) and an oxovanadium(IV) complex, [VO(bbimae)(NCS)2] • dma (dma = N,N-dimethylacetamide) (2) have been prepared and their crystal structures determined by X-ray diffraction. Crystal data for 1 at 293 K: a = 13.334(2). b = 17.048(2). c = 10.3829(9) Å, space group P21 21 21 Z = 4. and dcalcd = 1.41 gcm-3. Crystal data for 2 at 293 K: a = 14.099(2). b = 14.998(4), c= 14.051(2) Å, β= 107.634(9)°, space group P21 /c. Z = 4, and dcalcd = 1.36 gem-3. In the nickel(II) complex, (bbimae) functions as a tetradentate ligand, and the geometry around Ni(II) ion is best described as distorted octahedral. The structure is very similar to those of the corresponding Co(II) and Mn(II) complexes. In the case of 2, which is also distorted octahedral, (bbimae) is a tridentate ligand without the coordination of the alcohol group. The M-N (benzimidazole) distances are in the range of 1.95-2.18 Å, and also observed for other first-row transition metal complexes with (bbimae). and differ in the order V(IV) < Mn(II) > Co(II) > Ni(II) > Cu(II), consistent with effective ionic radii of the metal ions. Comparison of the structural parameters of these complexes with those of the metal ions in biological systems has supported the usefullnessof the tripod-like ligands to synthesis model compounds for biological systems.

Original languageEnglish
Pages (from-to)1307-1314
Number of pages8
JournalZeitschrift fur Naturforschung - Section B Journal of Chemical Sciences
Volume42
Issue number10
DOIs
Publication statusPublished - Oct 1 1987
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

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