Synthesis and Property of Tungsten Carbonyl Derivatives Based on 1H-(Pyrazol-1-ylmethyl)-1,2,3-benzotriazoles

Three complexes, (PBT)W(CO)(5) (1), (3,5-Me2PBT)W(CO)(5) (2) and (3,5-Pr'2PBT)W(CO)(5) (3) (PBT = 1H-(pyrazol-1-ylmethyl)-1,2,3-benzotriazole), were synthesized, and two of them were structurally characterized by X-ray crystallography. Complex 1 crystallizes in monoclinic with space group P2(1)/c, a = 1.0828(2), b = 2.1655(4), c = 0.6982(1) nm, beta = 93.39(3)degrees, V = 1.6343(6) nm(3), Z = 4, D-c= 2.126 g/cm(3), F(000) = 992, mu = 7.107 mm(-1), S = 0.990, the final R= 0.0301 and wR = 0.0685. Complex 2 crystallizes in triclinic with space group P (1) over bar, a = 0.95021(8), b = 0.98391(6), c = 1.1433(1) nm, alpha= 68.792(7), beta = 77.860(8), gamma= 75.533(6)degrees, V = 0.9563(1) nm(3), Z = 2, D-c = 1.914 g/cm(3), F(000) = 528, mu = 6.078 mm(-1), S = 1.042, the final R = 0.0253 and wR = 0.0549. 1H-(Pyrazol-1-ylmethyl)-1,2,3-benzotriazoles acted as monodentate ligands through the 3-position nitrogen of the triazolyl group, and the pyrazolyl nitrogen did not participate in coordinating to the metal centers in these complexes. Their UV and fluorescence properties have been studied.