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Four new Cu(II) complexes with two benzotriazole-based ligands, [Cu2(L1)2(NO3)2]· 2H2O (1), [Cu2(L1)2]·2ClO4·2H2O (2), [Cu2(HL2)2(NO3)4]·2CH3COCH3 (3) and [Cu(HL2)2(Cl)]·Cl·2CH2Cl2 (4), where HL1 = 1,3-bis(benzotriazol-2-yl)-