The coordination of heterocyclic thiourea ligands (L = N-(2-pyridyl)-N'-phenylthiourea (1), N-(2-pyridyl)-N'-methylthiourea (2), N-(3-pyridyl)-N'-phenylthiourea (3), N-(3-pyridyl)-N'-methylthiourea (4), N-(4-pyridyl)-N'-phenylthiourea (5), N-(2-pyrimidyl)-N'-phenylthiourea (6), N-(2-pyrimidyl)-N'-methylthiourea (7), N-(2-thiazolyl)-N'-methylthiourea (8), N-(2-benzothiazolyl)-N'-methylthiourea (9), N,N'-bis(2-pyridyl)thiourea (10) and N,N'-bis(3-pyridyl)thiourea (11)) with CuX (X = Cl, Br, I, NO(3)) has been investigated. CuX:L product stoichiometries of 1:1-1:5 were found, with 1:1 being most common. X-ray structures of four 3-coordinate mononuclear CuXL(2) complexes (CuCl(6)(2), CuCl(7)(2), CuBr(6)(2), and CuBr(9)(2)) are reported. In contrast, CuBr(1)(2) is a 1D sulfur-bridged polymer. CuIL structures (L = 7, 8) are 1D chains with corner-sharing Cu(2)(mu-I)(2) and Cu(2)(mu-S)(2) units, and CuCl(10) is a 2D network having mu-Cl and N-/S-bridging L. Two [CuL(2)]NO(3) structures are reported: a mononuclear 4-coordinate copper complex with chelating ligands (L = 10) and a 1D link-chain with N-/S-bridging L (L = 3). Two ligand oxidative cyclizations were encountered during crystallization. CuI crystallized with 6 to produce zigzag ladder polymer [(CuI)(2)(12)]center dot 1/2CH(3)CN (12=N-(pyrimidin-2-yl)benzo[d]thiazol-2-amine) and CuNO(3) crystallized with 10 to form [Cu(2)(NO(3))(13)(2)(MeCN)]NO(3) (13 = dipyridyltetraazathiapentalene).
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Saxena, Aakarsh; Dugan, Emily C.; Liaw, Jeffrey; Dembo, Matthew D.; and Pike, Robert D., Copper(I) Complexes of Heterocyclic Thiourea Ligands (2009). Polyhedron, 28(18), 4017-4031.