ChemInform Abstract: CRYSTAL STRUCTURE AND ELECTRICAL CONDUCTIVITY OF NICKEL 6,13‐DI(P‐TOLYL)‐5,14‐DIHYDRODIBENZO(B,I)‐1,4,8,11‐TETRAAZA(14)ANNULENE IODIDE (NI (DTDBTAA)I2.58)

Abstract

SummarySingle crystals of the title compound are monoclinic, space group P2,/n with two formula units per cell of the following dimensions: a= 18.209, b = 19.076, c= 4.075 A, /l= 92.43". The crystals show metallic conductivity along the needle axis from room temperature down to ca. 180 K, the maximum conductivity at room temperature being 455 (Qcm)-'.The unoxidized (iodine free) parent compound crystallizes in the monoclinic space group P 2 J c with 2 molecules per cell of dimensions: a=4.988, b=20.192, c = 11.871 A,/3=94.41". 1.Introduction. -It has recently been shown [l-31 that partial oxidation of metallotetraaza [ 14]annulenes by iodine leads to a large new class of highly conductive materials in which the properties can be manipulated by variation of the substituents and/or the central metal ion. In order to understand the effect of various substituents and metal atoms on the conductivity (and other physical properties) it is essential to obtain the data of single crystals of appropriate size and quality. Due to the difficulties experienced in growing crystals, most data published today refer to powders [I-31, often Here we demonstrate the effect of the relatively bulky tolyl substituents in the meso-positions of nickeldibenzo [b, i]-1,4,8,1 I-tetraaza [ 14lannulene on the structure and conductivity of the neutral and partially oxidized product.