Crystal and Molecular Structure of the Island Tetranuclear Dioxomolybdenum(VI) Complex [MoO2(L1)]4 (H2L1 Is Acetylacetone Isonicotinoylhydrazone) with Large Intra- and Intermolecular Channels.

The solvated complex [МоО₂(L¹)]₄dimethylformamide (I) was synthesized. Its structure was determined by X-ray diffraction analysis. The crystal structure is composed of the tetranuclear complexes [МоО₂(L¹)]₄ (Ia) as the structural units lying on crystallographic twofold axes. Both crystallographically independent molybdenum atoms are in a distorted octahedral coordination environment formed by two cis-О(oxo) ligands, two N(L¹) atoms of two molecules Ia in trans-positions to the О(oxo) ligands, and two О(L¹) atoms of one complex molecule in cis-positions to О(oxo) and trans- to each other. Each (L¹)^2– ligand is coordinated to two Мо atoms in a tetradentate tridentate-chelating (2О, N) bridging (N) mode. The average bond lengths in complex Iа are as follows: Мо–О(oxo), 1.701 Å; Мо–N(L¹), 2.460 (b) and 2.214 Å (c); Мо–О(L¹), 1.980 Å. The О(oxo)–МоО–(oxo) bond angle is 105.6°. The ordered dimethylformamide molecule is located in a narrow channel in the structure. The strongly disordered (non-located) solvent molecules (methanol/dimethylformamide/water) occupy wide channels in the structure of I. [ABSTRACT FROM AUTHOR]