X-RAY CRYSTAL-STRUCTURES AND UNUSUAL MAGNETIC-PROPERTIES OF ALKOXO-BRIDGED COPPER(II) COMPLEXES WITH 2-DIALKYLAMINOETHANOL AND 1-DIALKYLAMINO-2-PROPANOL

A series of alkoxo-bridged copper(II) complexes with 2-dialkylaminoethanol and 1-dialkylamino-2-propanol, [Cu2(R2NCH2CH2O)2(NCS)2] and [Cu2{R2NCH2CH(CH3)O}2(NCS)2] (R=CH3, C2H5, n-C3H7, i-C3H7), have been prepared and characterized by infrared and electronic spectroscopies, and temperature dependence of magnetic susceptibilities. The crystal structures of [CU2{i-C3H7)2NCH2CH2O}2(NCS)2] and [CU2{R2NCH2CH-(CH3)0}2(NCS)2] (R=CH3, C2H5, n-C3H7, i-C3H7) have been determined by X-ray crystallography. The compounds are polymeric with copper atoms alternately bridged by two alkoxo oxygen atoms and two thiocyanate ions, except for [CU2{(i-C3H7)2NCH2CH(CH3)012(NCS)2] which is a discrete alkoxo-bridged dinuclear molecule. The unusual magnetic properties are discussed in relation to the crystal structures.