Aluminum and Indium Complexes derived from Guanidines, Triazenes, and Amidines

Abstract

Abstract. The reaction of guanidines, triazenes, amidines, and lithium amidinates with trimethylamine alane ([AlH 3 (NMe 3 )]), lithium tetrahydridoaluminate, trimethylaluminum, aluminum trichloride, and indium trichloride is reported. Equimolar reactions utilising hindered N,

Bimetallic aluminum alkyl and iodide complexes stabilized by a bulky bis-guanidinate ligand

“…The Al-C bond lengths for the compounds 2 and 3 lie between 1.949(6) Å and 1.962(3) Å, these values are similar to the reported values of Al-C bond lengths. [6][7][8][9][10][11][12][13] The Al-I bond distances in 4 Al1-I1 is 2.507(2) Å and Al1-I2 is 2.521(2) Å which are well in agreement with the reported values. [6][7][8][9][10][11][12][13] The bite angles of the bridged bis-guanidine ligands N1-Al1-N2, which are 68.75 (16), 69.33 (10) and 71.19 (19) • 4 for 2-4, respectively.…”

“…5 To date, several examples of mononuclear guanidinato aluminum complexes, including aluminum alkyls and halides are known in the literature. [6][7][8][9][10][11][12][13] Recent reports suggest that dinuclear aluminum complexes are more important precursors for ring opening polymerization (ROP) of cyclic esters (e.g., lactide and ε-caprolactone), cyclic ethers (e.g., cyclohexne oxide (CHO) and propylene oxide (PO)) than their monometallic counterparts. [14][15][16] Despite the prominent role of cooperative effect between two aluminum centers, synthesis and catalytic application of well-characterized dinuclear aluminum complexes remain scarce.…”

Cyclic Carbonates from CO2 and Epoxides Catalyzed by Tetra- and Pentacoordinate Amidinate Aluminum Complexes

“…On the basis of the ability of aluminum centers to form pentacoordinate complexes, − we pursued the notion to access metallacyclic complexes of the type ( L n ) 2 AlMe ( n = 1, 2), which are expected to possess coordination number 5. Unfortunately, the reaction of L 1 H with 0.5 equiv of AlMe 3 in dry CH 2 Cl 2 for 2 h at room temperature did not reveal the presence of new complexes but resulted in the formation of 1 and free ligand.…”

Neutral and cationic enantiopure group 13 iminophosphonamide complexes

“…48 The Al-Cl bond length in complex 2 (Al-Cl 2.174(2) Å) is within the range (2.141(2)-2.202(6) Å) of related bis-amidinate aluminium monochloride complexes reported before. [49][50][51][52] The N1-P1-N2 bond angle of 96.2(2)°in complex 2 is slightly narrower than 96.46(9)°as seen in case of complex 1, however wider than 93.90(6)°as reported for [{Ph 2 P(NSiMe 3 ) 2 } 2 AlH]. 39 In complex 2, the two individual four membered N 2 PAl plane are twisted to each other with a dihedral angle of 49.92°.…”