The present invention relates to compounds having one of the following formulae (I) and (II):

##STR(I)##

##STR(II)##

and also to the uses thereof.

Oxo-nitrogenated iron complex having general formula (I): in which: R.sub.1 and R.sub.2, identical or different, represent a hydrogen atom; or they are selected from linear or branched, optionally halogenated C.sub.1-C.sub.20, preferably C.sub.1-C.sub.15, alkyl groups, optionally substituted cycloalkyl groups, optionally substituted aryl groups; R.sub.3 represents a hydrogen atom, or it is selected from linear or branched, optionally halogenated C.sub.1-C.sub.20, preferably C.sub.1-C.sub.15 alkyl groups, optionally substituted cycloalkyl groups, optionally substituted aryl groups; X, identical or different, represent a halogen atom such as, for example, chlorine, bromine, iodine, preferably chlorine; or they are selected from. linear or branched C.sub.1-C.sub.20, preferably C.sub.1-C.sub.15, alkyl groups, —OCOR.sub.4 groups or —OR.sub.4 groups in which R.sub.4 is selected from linear or branched C.sub.1-C.sub.20, preferably C.sub.1-C.sub.15, alkyl groups; n is 2 or 3. Said oxo-nitrogenated iron complex having general formula (I) can be advantageously used in a catalytic system for the (co)polymerization of conjugated dienes. ##STR00001##

Oxo-nitrogenated iron complex having general formula (I): in which: R.sub.1 and R.sub.2, identical or different, represent a hydrogen atom; or they are selected from linear or branched, optionally halogenated C.sub.1-C.sub.20, preferably C.sub.1-C.sub.15, alkyl groups, optionally substituted cycloalkyl groups, optionally substituted aryl groups; R.sub.3 represents a hydrogen atom, or it is selected from linear or branched, optionally halogenated C.sub.1-C.sub.20, preferably C.sub.1-C.sub.15 alkyl groups, optionally substituted cycloalkyl groups, optionally substituted aryl groups; X, identical or different, represent a halogen atom such as, for example, chlorine, bromine, iodine, preferably chlorine; or they are selected from. linear or branched C.sub.1-C.sub.20, preferably C.sub.1-C.sub.15, alkyl groups, —OCOR.sub.4 groups or —OR.sub.4 groups in which R.sub.4 is selected from linear or branched C.sub.1-C.sub.20, preferably C.sub.1-C.sub.15, alkyl groups; n is 2 or 3. Said oxo-nitrogenated iron complex having general formula (I) can be advantageously used in a catalytic system for the (co)polymerization of conjugated dienes. ##STR00001##

Oxo-nitrogenated iron complex having general formula (I): in which: R.sub.1 and R.sub.2, identical or different, represent a hydrogen atom; or they are selected from linear or branched, optionally halogenated C.sub.1-C.sub.20, preferably C.sub.1-C.sub.15, alkyl groups, optionally substituted cycloalkyl groups, optionally substituted aryl groups; R.sub.3 represents a hydrogen atom, or it is selected from linear or branched, optionally halogenated C.sub.1-C.sub.20, preferably C.sub.1-C.sub.15 alkyl groups, optionally substituted cycloalkyl groups, optionally substituted aryl groups; X, identical or different, represent a halogen atom such as, for example, chlorine, bromine, iodine, preferably chlorine; or they are selected from. linear or branched C.sub.1-C.sub.20, preferably C.sub.1-C.sub.15, alkyl groups, —OCOR.sub.4 groups or —OR.sub.4 groups in which R.sub.4 is selected from linear or branched C.sub.1-C.sub.20, preferably C.sub.1-C.sub.15, alkyl groups; n is 2 or 3. Said oxo-nitrogenated iron complex having general formula (I) can be advantageously used in a catalytic system for the (co)polymerization of conjugated dienes. ##STR00001##

The invention relates to a family of Pd(II)-based catalysts of general formula (I) reproduced below for use in the production of olefin/polar vinyl monomer copolymers and olefin homopolymers. The invention also refers to ligands that are intermediates in the synthesis of the catalysts, to the process for the synthesis of homo- and copolymers using these catalysts, and to the homo- and copolymers thus obtained.

A raw material for forming a thin film, comprising a compound represented by General Formula (1) below. ##STR00001## wherein R.sup.1 represents an isopropyl group, R.sup.2 represents a methyl group, R.sup.3 and R.sup.4 each independently represent a linear or branched alkyl group having 1 to 5 carbon atoms, A represents a propane-1,2-diyl group and M represents copper, nickel, cobalt or manganese.

A raw material for forming a thin film, comprising a compound represented by General Formula (1) below. ##STR00001## wherein R.sup.1 represents an isopropyl group, R.sup.2 represents a methyl group, R.sup.3 and R.sup.4 each independently represent a linear or branched alkyl group having 1 to 5 carbon atoms, A represents a propane-1,2-diyl group and M represents copper, nickel, cobalt or manganese.

The present invention relates to a modifier represented by Formula 1, a method of preparing the same, a modified conjugated diene-based polymer having a high modification ratio which includes a modifier-derived functional group, and a method of preparing the polymer.

The present invention relates to a modifier represented by Formula 1, a method of preparing the same, a modified conjugated diene-based polymer having a high modification ratio which includes a modifier-derived functional group, and a method of preparing the polymer.

The present invention provides a system and method of storing hydrogen (H.sub.2) and releasing it on demand, comprising and making use of diaminoalkanes and alcohols, or aminoalcohols as liquid-organic hydrogen carrier systems (LOHC). 2-amino-ethanol (AE) or its N-methyl derivative 2-(methylamino)ethanol undergo catalytic dehydrogenation to form a cyclic dipeptide (glycine anhydride—GA) or its N,N-dimethyl derivative (N,N-dimethyl GA) with release of hydrogen. Similarly, ethylenediamine (ED) and ethanol undergo catalytic dehydrogenation to form N,N′-diacetylethylenediamine (DAE) with release of hydrogen. Glycine anhydride (GA) or N,N-dimethyl-GA may be hydrogenated back to 2-aminoethanol (AE) or 2-(methylamino)ethanol, respectively, each of which functions as a hydrogen storage system. N,N′-diacetylethylenediamine (DAE) may be hydrogenated back to ED and ethanol, which functions as a hydrogen storage system. These reactions may be catalyzed by a variety of compounds or complexes, including Ruthenium complexes as described herein.