a organic metal complex compound represented by the following formula , which has an electroconductivity of at most 110 μs / cm when dispersed in ion - exchanged water in an amount of 1 wt %: wherein m is a coordinated center metal selected from the group consisting of sc , ti , v , cr , co , ni , mn and fe ; ar is an aryl group selected from the group consisting of a substituted or unsubstituted phenyl group and a substituted or unsubstituted naphthyl group , the substituents of which are selected from the group consisting of a c 1 - c 18 alkyl group , a c 1 - c 18 alkoxy group , a nitro group , a halogen group , an alkenyl group , a sulfonamide group , a sulfonalkyl group , a sulfonic acid group , a carboxyl group , a carboxyester group , a hydroxyl group , an acetylamino group , a benzoylamino group , a substituted or unsubstituted anilide group ; x and y are — s —, — o —, — co —, — coo —, — nh — or — nr — ; k + is a hydrogen ion , a lithium ion , a sodium ion , a potassium ion , an ammonium ion , an organic ammonium ion , or a mixture thereof ; m is a number of an azo compound coordinated to a metal m , and is 1 , 2 , 3 or 6 ; p is a valence of a metal m ; n is 1 , 2 or 4 ; and q is 0 or an integer .