Spermine adducts of metal alkoxides

A coordination polymer with unusual structural features from imidazolylbutyric acid and titanium isopropoxide

“…Reaction of Ti(O i Pr) 4 with 4-(imidazol-1-yl)butyric acid resulted in the formation of the coordination polymer [Ti(O i Pr) 3 (OOCCH 2 CH 2 CH 2 C 3 N 2 H 3 )] n ( 1 ). Only few one-dimensional titanium-containing coordination polymers were hitherto structurally characterized [ 20 ], among them also adducts of Ti(OR) 4 with diamines [ 14 – 16 ]. A metal–organic framework with Ti 8 O 8 (OH) 4 units as connector and terephthalate linkers was obtained from Ti(O i Pr) 4 and terephthalic acid [ 21 ], and materials at the borderline between sol–gel and metal–organic framework structures in the reaction with tri- and tetracarboxylic acids [ 22 ].…”

“…Two main types of derivatives are known: (1) adducts of neutral Lewis bases (LB) of the general composition Ti(OR) 4 (LB), and (2) derivatives Ti(OR) 4− x (CL) x where one or more OR groups of Ti(OR) 4 were substituted by an anionic chelating ligand (CL) and which are prepared by reaction of Ti(OR) 4 with CL–H. The structures of mono-substituted derivatives Ti(OR) 3 (CL) with β -diketonates [ 3 ], aminoalcoholates [ 4 , 5 ], β -aminocarboxylates [ 6 ], oximates [ 7 , 8 ], and others as ligands are related to that of the adducts Ti(OR) 4 (LB) with alcohols [ 9 – 11 ] or amines as bases [ 12 – 16 ]. Both types are OR-bridged dimers with octahedrally coordinated titanium atoms.…”