Syntheses and Properties of Nickel(I) and Nickel(II) Complexes of a Series of Macrocyclic N4 Ligands: Crystal Structures of C-RSSR-[NiIHTIM](ClO4), C-RSSR-[NiIIHTIM](ClO4)2, C-RRSS-[NiIIHTIM](ClO4)2, and [NiIITIM](ClO4)2 (HTIM = 2,3,9,10-Tetramethyl-1,4,8,11-tetraazacyclotetradecane, TIM = 2,3,9,10-Tetramethyl-1,4,8,11-tetraazacyclotetradeca-1,3,8,10-tetraene)

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