Synthesis and charaterization of group 6 metal carbonyl complexes with cyclotriphosphazene ligands

Abstract

Via substitution reactions between [$M(CO)_5Cl$][PPN] (PPN = bis (triphenylphosphoranylidene) ammonium) and [$P_3N_3Cl_4Ph$] ($BEt_3$)Li(2) and ligand exchange reactions between $M(CO)_3(MeCN)_3$ and $[PN(3,5-Me_2C_3N_2H)_2]_3$ (4), a series of $[M(CO)_5P_3N_3Cl_4Ph]$[PPN] (M= Cr(3a); Mo(3b); W(3c)) type and $M(CO)_3[PN(3,5-Me_2C_3N_2H)_2]_3$ (M= Cr(5a); Mo(5b); W(5c)) type complexes were synthesized, respectively. The organo-metallic complexes, (3a)-(3c) and (5a)-(5c) has been characterized by means of spectroscopic methods. The structure of (5a) was established by X- ray crystallography. It crystallizes in the $p2_1$/n space group with a=13.628(2), b=14.412(2), c=23.122(2)$\mbox{\AA}$, $\beta$=103.60(1)$^\circ$, V=4416.93$\mbox{\AA}^3$ and Z=4. The structure of compounds (5b) and (5c) also has been indirectly proven to be similar with (5a) based on the vibrational spectroscopic data.